56997857778 has 16 divisors (see below), whose sum is σ = 114654652416. Its totient is φ = 18889463120.

The previous prime is 56997857753. The next prime is 56997857779. The reversal of 56997857778 is 87775879965.

56997857778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×56997857778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56997857779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27454578 + ... + 27456653.

It is an arithmetic number, because the mean of its divisors is an integer number (7165915776).

Almost surely, 2^56997857778 is an apocalyptic number.

56997857778 is an abundant number, since it is smaller than the sum of its proper divisors (57656794638).

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

56997857778 is a wasteful number, since it uses less digits than its factorization.

56997857778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54911409.

The product of its digits is 1867017600, while the sum is 78.

The spelling of 56997857778 in words is "fifty-six billion, nine hundred ninety-seven million, eight hundred fifty-seven thousand, seven hundred seventy-eight".