2158589777796 has 135 divisors (see below), whose sum is σ = 5833099050933. Its totient is φ = 696054824640.

The previous prime is 2158589777783. The next prime is 2158589777819. The reversal of 2158589777796 is 6977779858512.

The square root of 2158589777796 is 1469214.

It is a perfect power (a square), and thus also a powerful number.

2158589777796 is a `hidden beast` number, since 21 + 5 + 8 + 589 + 7 + 7 + 7 + 7 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 353156832900 + 1805432944896 = 594270^2 + 1343664^2 .

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 819820096 + ... + 819822728.

Almost surely, 2^{2158589777796} is an apocalyptic number.

2158589777796 is the 1469214-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2158589777796

2158589777796 is an abundant number, since it is smaller than the sum of its proper divisors (3674509273137).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2158589777796 is an frugal number, since it uses more digits than its factorization.

2158589777796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5344 (or 2669 counting only the distinct ones).

The product of its digits is 3734035200, while the sum is 81.

Multiplying 2158589777796 by its sum of digits (81), we get a square (174845772001476 = 13222926²).

2158589777796 divided by its sum of digits (81) gives a square (26649256516 = 163246²).

The spelling of 2158589777796 in words is "two trillion, one hundred fifty-eight billion, five hundred eighty-nine million, seven hundred seventy-seven thousand, seven hundred ninety-six".