164701556921 has 8 divisors (see below), whose sum is σ = 179687299584. Its totient is φ = 149717959920.

The previous prime is 164701556917. The next prime is 164701556927. The reversal of 164701556921 is 129655107461.

164701556921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 164701556921 - 2² = 164701556917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164701556927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373766 + ... + 684911.

It is an arithmetic number, because the mean of its divisors is an integer number (22460912448).

Almost surely, 2^164701556921 is an apocalyptic number.

164701556921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

164701556921 is a deficient number, since it is larger than the sum of its proper divisors (14985742663).

164701556921 is a wasteful number, since it uses less digits than its factorization.

164701556921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072831.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 164701556921 in words is "one hundred sixty-four billion, seven hundred one million, five hundred fifty-six thousand, nine hundred twenty-one".