164821725 has 18 divisors (see below), whose sum is σ = 295214426. Its totient is φ = 87904800.

The previous prime is 164821697. The next prime is 164821759. The reversal of 164821725 is 527128461.

164821725 is a `hidden beast` number, since 1 + 6 + 482 + 172 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 3709476 + 161112249 = 1926^2 + 12693^2 .

It is not a de Polignac number, because 164821725 - 2⁵ = 164821693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164821725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 366046 + ... + 366495.

Almost surely, 2^164821725 is an apocalyptic number.

164821725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164821725 is a deficient number, since it is larger than the sum of its proper divisors (130392701).

164821725 is a wasteful number, since it uses less digits than its factorization.

164821725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732557 (or 732549 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 164821725 is about 12838.2913582766. The cubic root of 164821725 is about 548.2830479186.

The spelling of 164821725 in words is "one hundred sixty-four million, eight hundred twenty-one thousand, seven hundred twenty-five".