2151765756 has 96 divisors (see below), whose sum is σ = 6402816000. Its totient is φ = 612166464.

The previous prime is 2151765743. The next prime is 2151765761. The reversal of 2151765756 is 6575671512.

2151765756 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 76 + 575 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174730 + ... + 186638.

It is an arithmetic number, because the mean of its divisors is an integer number (66696000).

Almost surely, 2^2151765756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151765756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3201408000).

2151765756 is an abundant number, since it is smaller than the sum of its proper divisors (4251050244).

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

2151765756 is a wasteful number, since it uses less digits than its factorization.

2151765756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12168 (or 12160 counting only the distinct ones).

The product of its digits is 441000, while the sum is 45.

The square root of 2151765756 is about 46387.1292062788. The cubic root of 2151765756 is about 1291.0161166602.

The spelling of 2151765756 in words is "two billion, one hundred fifty-one million, seven hundred sixty-five thousand, seven hundred fifty-six".