64157171373225 has 108 divisors (see below), whose sum is σ = 133677402943500. Its totient is φ = 29328216825600.

The previous prime is 64157171373143. The next prime is 64157171373227. The reversal of 64157171373225 is 52237317175146.

64157171373225 is a `hidden beast` number, since 6 + 4 + 1 + 571 + 7 + 1 + 37 + 32 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1439704815129 + 62717466558096 = 1199877^2 + 7919436^2 .

It is not a de Polignac number, because 64157171373225 - 2⁸ = 64157171372969 is a prime.

It is a super-2 number, since 2×64157171373225² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64157171373227) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 735864135 + ... + 735951315.

Almost surely, 2^{64157171373225} is an apocalyptic number.

It is an amenable number.

64157171373225 is an abundant number, since it is smaller than the sum of its proper divisors (69520231570275).

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

64157171373225 is a wasteful number, since it uses less digits than its factorization.

64157171373225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153960 (or 153945 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 54.

The spelling of 64157171373225 in words is "sixty-four trillion, one hundred fifty-seven billion, one hundred seventy-one million, three hundred seventy-three thousand, two hundred twenty-five".