172216686868 has 6 divisors (see below), whose sum is σ = 301379202026. Its totient is φ = 86108343432.

The previous prime is 172216686853. The next prime is 172216686871. The reversal of 172216686868 is 868686612271.

It can be written as a sum of positive squares in only one way, i.e., 96011980164 + 76204706704 = 309858^2 + 276052^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21527085855 + ... + 21527085862.

Almost surely, 2^172216686868 is an apocalyptic number.

It is an amenable number.

172216686868 is a deficient number, since it is larger than the sum of its proper divisors (129162515158).

172216686868 is a wasteful number, since it uses less digits than its factorization.

172216686868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43054171721 (or 43054171719 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 61.

The spelling of 172216686868 in words is "one hundred seventy-two billion, two hundred sixteen million, six hundred eighty-six thousand, eight hundred sixty-eight".