56821455494657 has 32 divisors (see below), whose sum is σ = 67564618383360. Its totient is φ = 46759671887040.

The previous prime is 56821455494651. The next prime is 56821455494677. The reversal of 56821455494657 is 75649455412865.

It is a de Polignac number, because none of the positive numbers 2^k-56821455494657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56821455494651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 859504598 + ... + 859570704.

It is an arithmetic number, because the mean of its divisors is an integer number (2111394324480).

Almost surely, 2^{56821455494657} is an apocalyptic number.

It is an amenable number.

56821455494657 is a deficient number, since it is larger than the sum of its proper divisors (10743162888703).

56821455494657 is a wasteful number, since it uses less digits than its factorization.

56821455494657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97461.

The product of its digits is 1451520000, while the sum is 71.

The spelling of 56821455494657 in words is "fifty-six trillion, eight hundred twenty-one billion, four hundred fifty-five million, four hundred ninety-four thousand, six hundred fifty-seven".