172406896779 has 32 divisors (see below), whose sum is σ = 248767593984. Its totient is φ = 105578968320.

The previous prime is 172406896757. The next prime is 172406896841. The reversal of 172406896779 is 977698604271.

It is not a de Polignac number, because 172406896779 - 2⁹ = 172406896267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172406896279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18960024 + ... + 18969114.

It is an arithmetic number, because the mean of its divisors is an integer number (7773987312).

Almost surely, 2^172406896779 is an apocalyptic number.

172406896779 is a deficient number, since it is larger than the sum of its proper divisors (76360697205).

172406896779 is a wasteful number, since it uses less digits than its factorization.

172406896779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11427.

The product of its (nonzero) digits is 64012032, while the sum is 66.

The spelling of 172406896779 in words is "one hundred seventy-two billion, four hundred six million, eight hundred ninety-six thousand, seven hundred seventy-nine".