164351424162521 has 4 divisors (see below), whose sum is σ = 164351674939344. Its totient is φ = 164351173385700.

The previous prime is 164351424162451. The next prime is 164351424162553. The reversal of 164351424162521 is 125261424153461.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164351424162521 is a prime.

It is a super-2 number, since 2×164351424162521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164351424162421) 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, 124402775 + ... + 125716956.

It is an arithmetic number, because the mean of its divisors is an integer number (41087918734836).

Almost surely, 2^{164351424162521} is an apocalyptic number.

It is an amenable number.

164351424162521 is a deficient number, since it is larger than the sum of its proper divisors (250776823).

164351424162521 is an equidigital number, since it uses as much as digits as its factorization.

164351424162521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250776822.

The product of its digits is 1382400, while the sum is 47.

The spelling of 164351424162521 in words is "one hundred sixty-four trillion, three hundred fifty-one billion, four hundred twenty-four million, one hundred sixty-two thousand, five hundred twenty-one".