2129789574685 has 4 divisors (see below), whose sum is σ = 2555747489628. Its totient is φ = 1703831659744.

The previous prime is 2129789574683. The next prime is 2129789574697. The reversal of 2129789574685 is 5864759879212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 707060675161 + 1422728899524 = 840869^2 + 1192782^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129789574685 - 2¹ = 2129789574683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129789574683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212978957464 + ... + 212978957473.

It is an arithmetic number, because the mean of its divisors is an integer number (638936872407).

Almost surely, 2^{2129789574685} is an apocalyptic number.

It is an amenable number.

2129789574685 is a deficient number, since it is larger than the sum of its proper divisors (425957914943).

2129789574685 is an equidigital number, since it uses as much as digits as its factorization.

2129789574685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425957914942.

The product of its digits is 609638400, while the sum is 73.

The spelling of 2129789574685 in words is "two trillion, one hundred twenty-nine billion, seven hundred eighty-nine million, five hundred seventy-four thousand, six hundred eighty-five".