164649915 has 40 divisors (see below), whose sum is σ = 310698960. Its totient is φ = 83187648.

The previous prime is 164649899. The next prime is 164649937. The reversal of 164649915 is 519946461.

It is a happy number.

It is not a de Polignac number, because 164649915 - 2⁴ = 164649899 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 polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3004 + ... + 18393.

It is an arithmetic number, because the mean of its divisors is an integer number (7767474).

Almost surely, 2^164649915 is an apocalyptic number.

164649915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

164649915 is a deficient number, since it is larger than the sum of its proper divisors (146049045).

164649915 is a wasteful number, since it uses less digits than its factorization.

164649915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21433 (or 21424 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 164649915 is about 12831.5983026278. The cubic root of 164649915 is about 548.0924717856.

The spelling of 164649915 in words is "one hundred sixty-four million, six hundred forty-nine thousand, nine hundred fifteen".