164662521 has 4 divisors (see below), whose sum is σ = 219550032. Its totient is φ = 109775012.

The previous prime is 164662513. The next prime is 164662541. The reversal of 164662521 is 125266461.

164662521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125266461 = 3 ⋅41755487.

It is a cyclic number.

It is not a de Polignac number, because 164662521 - 2³ = 164662513 is a prime.

It is a super-2 number, since 2×164662521² = 54227491644150882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (164662541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27443751 + ... + 27443756.

It is an arithmetic number, because the mean of its divisors is an integer number (54887508).

Almost surely, 2^164662521 is an apocalyptic number.

It is an amenable number.

164662521 is a deficient number, since it is larger than the sum of its proper divisors (54887511).

164662521 is an equidigital number, since it uses as much as digits as its factorization.

164662521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54887510.

The product of its digits is 17280, while the sum is 33.

The square root of 164662521 is about 12832.0895024933. The cubic root of 164662521 is about 548.1064591951.

The spelling of 164662521 in words is "one hundred sixty-four million, six hundred sixty-two thousand, five hundred twenty-one".