164245020340621 has 4 divisors (see below), whose sum is σ = 179176385826144. Its totient is φ = 149313654855100.

The previous prime is 164245020340571. The next prime is 164245020340657. The reversal of 164245020340621 is 126043020542461.

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 not a de Polignac number, because 164245020340621 - 2⁹ = 164245020340109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164245020340691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7465682742745 + ... + 7465682742766.

It is an arithmetic number, because the mean of its divisors is an integer number (44794096456536).

Almost surely, 2^{164245020340621} is an apocalyptic number.

164245020340621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

164245020340621 is a deficient number, since it is larger than the sum of its proper divisors (14931365485523).

164245020340621 is a wasteful number, since it uses less digits than its factorization.

164245020340621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14931365485522.

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 164245020340621 in words is "one hundred sixty-four trillion, two hundred forty-five billion, twenty million, three hundred forty thousand, six hundred twenty-one".