172809357057 has 12 divisors (see below), whose sum is σ = 254924442240. Its totient is φ = 112755041208.

The previous prime is 172809357053. The next prime is 172809357067. The reversal of 172809357057 is 750753908271.

It is a happy number.

172809357057 is a `hidden beast` number, since 1 + 7 + 280 + 9 + 357 + 0 + 5 + 7 = 666.

It is not a de Polignac number, because 172809357057 - 2² = 172809357053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172809356994 and 172809357012.

It is not an unprimeable number, because it can be changed into a prime (172809357053) 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, 204265957 + ... + 204266802.

It is an arithmetic number, because the mean of its divisors is an integer number (21243703520).

Almost surely, 2^172809357057 is an apocalyptic number.

It is an amenable number.

172809357057 is a deficient number, since it is larger than the sum of its proper divisors (82115085183).

172809357057 is a wasteful number, since it uses less digits than its factorization.

172809357057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408532812 (or 408532809 counting only the distinct ones).

The product of its (nonzero) digits is 3704400, while the sum is 54.

The spelling of 172809357057 in words is "one hundred seventy-two billion, eight hundred nine million, three hundred fifty-seven thousand, fifty-seven".