164779425 has 36 divisors (see below), whose sum is σ = 297796044. Its totient is φ = 87091200.

The previous prime is 164779411. The next prime is 164779441. The reversal of 164779425 is 524977461.

It can be written as a sum of positive squares in 6 ways, for example, as 5716881 + 159062544 = 2391^2 + 12612^2 .

It is not a de Polignac number, because 164779425 - 2⁴ = 164779409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 22185 + ... + 28665.

Almost surely, 2^164779425 is an apocalyptic number.

164779425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164779425 is a deficient number, since it is larger than the sum of its proper divisors (133016619).

164779425 is a wasteful number, since it uses less digits than its factorization.

164779425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6610 (or 6602 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 164779425 is about 12836.6438370783. The cubic root of 164779425 is about 548.2361399493.

The spelling of 164779425 in words is "one hundred sixty-four million, seven hundred seventy-nine thousand, four hundred twenty-five".