164521425 has 48 divisors (see below), whose sum is σ = 282606912. Its totient is φ = 84384000.

The previous prime is 164521417. The next prime is 164521447. The reversal of 164521425 is 524125461.

It is not a de Polignac number, because 164521425 - 2³ = 164521417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 164521392 and 164521401.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 279982 + ... + 280568.

It is an arithmetic number, because the mean of its divisors is an integer number (5887644).

Almost surely, 2^164521425 is an apocalyptic number.

164521425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164521425 is a deficient number, since it is larger than the sum of its proper divisors (118085487).

164521425 is a wasteful number, since it uses less digits than its factorization.

164521425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738 (or 733 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 164521425 is about 12826.5905446459. The cubic root of 164521425 is about 547.9498606603.

Adding to 164521425 its reverse (524125461), we get a palindrome (688646886).

The spelling of 164521425 in words is "one hundred sixty-four million, five hundred twenty-one thousand, four hundred twenty-five".