164889409979 has 16 divisors (see below), whose sum is σ = 192140233920. Its totient is φ = 138566263680.

The previous prime is 164889409939. The next prime is 164889409987. The reversal of 164889409979 is 979904988461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164889409979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164889409939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351437 + ... + 673265.

It is an arithmetic number, because the mean of its divisors is an integer number (12008764620).

Almost surely, 2^164889409979 is an apocalyptic number.

164889409979 is a deficient number, since it is larger than the sum of its proper divisors (27250823941).

164889409979 is a wasteful number, since it uses less digits than its factorization.

164889409979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323270.

The product of its (nonzero) digits is 282175488, while the sum is 74.

The spelling of 164889409979 in words is "one hundred sixty-four billion, eight hundred eighty-nine million, four hundred nine thousand, nine hundred seventy-nine".