164021725 has 24 divisors (see below), whose sum is σ = 233149760. Its totient is φ = 112129920.

The previous prime is 164021701. The next prime is 164021731. The reversal of 164021725 is 527120461.

It is not a de Polignac number, because 164021725 - 2⁷ = 164021597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 164021693 and 164021702.

It is a congruent 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, 65089 + ... + 67561.

Almost surely, 2^164021725 is an apocalyptic number.

It is an amenable number.

164021725 is a deficient number, since it is larger than the sum of its proper divisors (69128035).

164021725 is a wasteful number, since it uses less digits than its factorization.

164021725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869 (or 2864 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 164021725 is about 12807.0966655210. The cubic root of 164021725 is about 547.3945363745.

The spelling of 164021725 in words is "one hundred sixty-four million, twenty-one thousand, seven hundred twenty-five".