172660646078638 has 32 divisors (see below), whose sum is σ = 268029012636000. Its totient is φ = 83320030510080.

The previous prime is 172660646078581. The next prime is 172660646078647. The reversal of 172660646078638 is 836870646066271.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4768427478 + ... + 4768463686.

It is an arithmetic number, because the mean of its divisors is an integer number (8375906644875).

Almost surely, 2^{172660646078638} is an apocalyptic number.

172660646078638 is a deficient number, since it is larger than the sum of its proper divisors (95368366557362).

172660646078638 is a wasteful number, since it uses less digits than its factorization.

172660646078638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66900.

The product of its (nonzero) digits is 585252864, while the sum is 70.

The spelling of 172660646078638 in words is "one hundred seventy-two trillion, six hundred sixty billion, six hundred forty-six million, seventy-eight thousand, six hundred thirty-eight".