56897321656 has 64 divisors (see below), whose sum is σ = 124272403200. Its totient is φ = 23916542208.

The previous prime is 56897321651. The next prime is 56897321659. The reversal of 56897321656 is 65612379865.

It is a self number, because there is not a number n which added to its sum of digits gives 56897321656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56897321651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444236 + ... + 1483108.

It is an arithmetic number, because the mean of its divisors is an integer number (1941756300).

Almost surely, 2^56897321656 is an apocalyptic number.

56897321656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56897321656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62136201600).

56897321656 is an abundant number, since it is smaller than the sum of its proper divisors (67375081544).

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

56897321656 is a wasteful number, since it uses less digits than its factorization.

56897321656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39388 (or 39384 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 58.

The spelling of 56897321656 in words is "fifty-six billion, eight hundred ninety-seven million, three hundred twenty-one thousand, six hundred fifty-six".