164651825 has 24 divisors (see below), whose sum is σ = 229443648. Its totient is φ = 116297280.

The previous prime is 164651807. The next prime is 164651843. The reversal of 164651825 is 528156461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (164651807) and next prime (164651843).

It is not a de Polignac number, because 164651825 - 2²⁶ = 97542961 is a prime.

It is a super-2 number, since 2×164651825² = 54220446951661250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3539 + ... + 18488.

It is an arithmetic number, because the mean of its divisors is an integer number (9560152).

Almost surely, 2^164651825 is an apocalyptic number.

It is an amenable number.

164651825 is a deficient number, since it is larger than the sum of its proper divisors (64791823).

164651825 is a wasteful number, since it uses less digits than its factorization.

164651825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22073 (or 22068 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 164651825 is about 12831.6727280585. The cubic root of 164651825 is about 548.0945911360.

The spelling of 164651825 in words is "one hundred sixty-four million, six hundred fifty-one thousand, eight hundred twenty-five".