172861863057 has 24 divisors (see below), whose sum is σ = 269249716008. Its totient is φ = 106236691200.

The previous prime is 172861863047. The next prime is 172861863059. The reversal of 172861863057 is 750368168271.

It is a happy number.

172861863057 is a `hidden beast` number, since 17 + 2 + 8 + 618 + 6 + 3 + 0 + 5 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 24175274256 + 148686588801 = 155484^2 + 385599^2 .

It is not a de Polignac number, because 172861863057 - 2¹⁵ = 172861830289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172861862994 and 172861863012.

It is not an unprimeable number, because it can be changed into a prime (172861863059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 881694 + ... + 1059767.

It is an arithmetic number, because the mean of its divisors is an integer number (11218738167).

Almost surely, 2^172861863057 is an apocalyptic number.

It is an amenable number.

172861863057 is a deficient number, since it is larger than the sum of its proper divisors (96387852951).

172861863057 is a wasteful number, since it uses less digits than its factorization.

172861863057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942241 (or 1942238 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 172861863057 in words is "one hundred seventy-two billion, eight hundred sixty-one million, eight hundred sixty-three thousand, fifty-seven".