172764247491999 has 16 divisors (see below), whose sum is σ = 271002741164640. Its totient is φ = 108401096465280.

The previous prime is 172764247491971. The next prime is 172764247492019. The reversal of 172764247491999 is 999194742467271.

It is a happy number.

172764247491999 is a `hidden beast` number, since 1 + 7 + 2 + 7 + 6 + 42 + 474 + 9 + 19 + 99 = 666.

172764247491999 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172764247491999 - 2²⁷ = 172764113274271 is a prime.

It is a super-2 number, since 2×172764247491999² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172764247091999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188196347572 + ... + 188196348489.

It is an arithmetic number, because the mean of its divisors is an integer number (16937671322790).

Almost surely, 2^{172764247491999} is an apocalyptic number.

172764247491999 is a deficient number, since it is larger than the sum of its proper divisors (98238493672641).

172764247491999 is a wasteful number, since it uses less digits than its factorization.

172764247491999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376392696087 (or 376392696081 counting only the distinct ones).

The product of its digits is 3456649728, while the sum is 81.

The spelling of 172764247491999 in words is "one hundred seventy-two trillion, seven hundred sixty-four billion, two hundred forty-seven million, four hundred ninety-one thousand, nine hundred ninety-nine".