172932667856647 has 2 divisors, whose sum is σ = 172932667856648. Its totient is φ = 172932667856646.

The previous prime is 172932667856639. The next prime is 172932667856651. The reversal of 172932667856647 is 746658766239271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172932667856647 - 2³ = 172932667856639 is a prime.

It is a super-2 number, since 2×172932667856647² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172932667856447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86466333928323 + 86466333928324.

It is an arithmetic number, because the mean of its divisors is an integer number (86466333928324).

Almost surely, 2^{172932667856647} is an apocalyptic number.

172932667856647 is a deficient number, since it is larger than the sum of its proper divisors (1).

172932667856647 is an equidigital number, since it uses as much as digits as its factorization.

172932667856647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7681443840, while the sum is 79.

The spelling of 172932667856647 in words is "one hundred seventy-two trillion, nine hundred thirty-two billion, six hundred sixty-seven million, eight hundred fifty-six thousand, six hundred forty-seven".