8157973225 has 6 divisors (see below), whose sum is σ = 10115886830. Its totient is φ = 6526378560.

The previous prime is 8157973217. The next prime is 8157973283. The reversal of 8157973225 is 5223797518.

It can be written as a sum of positive squares in 3 ways, for example, as 262051344 + 7895921881 = 16188^2 + 88859^2 .

It is not a de Polignac number, because 8157973225 - 2³ = 8157973217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163159440 + ... + 163159489.

Almost surely, 2^8157973225 is an apocalyptic number.

It is an amenable number.

8157973225 is a deficient number, since it is larger than the sum of its proper divisors (1957913605).

8157973225 is a wasteful number, since it uses less digits than its factorization.

8157973225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326318939 (or 326318934 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 49.

The square root of 8157973225 is about 90321.4992402141. The cubic root of 8157973225 is about 2013.0787224961.

The spelling of 8157973225 in words is "eight billion, one hundred fifty-seven million, nine hundred seventy-three thousand, two hundred twenty-five".