64537080991857 has 12 divisors (see below), whose sum is σ = 93361257197364. Its totient is φ = 42959630308320.

The previous prime is 64537080991847. The next prime is 64537080991927. The reversal of 64537080991857 is 75819908073546.

64537080991857 is a `hidden beast` number, since 6 + 4 + 537 + 0 + 8 + 0 + 9 + 9 + 1 + 85 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 57647589945201 + 6889491046656 = 7592601^2 + 2624784^2 .

It is not a de Polignac number, because 64537080991857 - 2⁷ = 64537080991729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64537080991837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5424189798 + ... + 5424201695.

It is an arithmetic number, because the mean of its divisors is an integer number (7780104766447).

Almost surely, 2^{64537080991857} is an apocalyptic number.

It is an amenable number.

64537080991857 is a deficient number, since it is larger than the sum of its proper divisors (28824176205507).

64537080991857 is a wasteful number, since it uses less digits than its factorization.

64537080991857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10848392160 (or 10848392157 counting only the distinct ones).

The product of its (nonzero) digits is 457228800, while the sum is 72.

The spelling of 64537080991857 in words is "sixty-four trillion, five hundred thirty-seven billion, eighty million, nine hundred ninety-one thousand, eight hundred fifty-seven".