164506779625 has 8 divisors (see below), whose sum is σ = 205304461128. Its totient is φ = 131605423600.

The previous prime is 164506779589. The next prime is 164506779637. The reversal of 164506779625 is 526977605461.

It can be written as a sum of positive squares in 4 ways, for example, as 977125081 + 163529654544 = 31259^2 + 404388^2 .

It is not a de Polignac number, because 164506779625 - 2⁹ = 164506779113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164506779625.

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 7 ways as a sum of consecutive naturals, for example, 658026994 + ... + 658027243.

It is an arithmetic number, because the mean of its divisors is an integer number (25663057641).

Almost surely, 2^164506779625 is an apocalyptic number.

It is an amenable number.

164506779625 is a deficient number, since it is larger than the sum of its proper divisors (40797681503).

164506779625 is an equidigital number, since it uses as much as digits as its factorization.

164506779625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316054252 (or 1316054242 counting only the distinct ones).

The product of its (nonzero) digits is 19051200, while the sum is 58.

The spelling of 164506779625 in words is "one hundred sixty-four billion, five hundred six million, seven hundred seventy-nine thousand, six hundred twenty-five".