2557121756 has 12 divisors (see below), whose sum is σ = 5114243568. Its totient is φ = 1095909312.

The previous prime is 2557121753. The next prime is 2557121767. The reversal of 2557121756 is 6571217552.

It is a happy number.

2557121756 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557121753) 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, 45662861 + ... + 45662916.

It is an arithmetic number, because the mean of its divisors is an integer number (426186964).

Almost surely, 2^2557121756 is an apocalyptic number.

It is an amenable number.

2557121756 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2557121756 is a wasteful number, since it uses less digits than its factorization.

2557121756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91325788 (or 91325786 counting only the distinct ones).

The product of its digits is 147000, while the sum is 41.

The square root of 2557121756 is about 50567.9914174965. The cubic root of 2557121756 is about 1367.4678850826.

The spelling of 2557121756 in words is "two billion, five hundred fifty-seven million, one hundred twenty-one thousand, seven hundred fifty-six".