164721905050 has 24 divisors (see below), whose sum is σ = 322508152800. Its totient is φ = 62420932080.

The previous prime is 164721905003. The next prime is 164721905063. The reversal of 164721905050 is 50509127461.

It is a junction number, because it is equal to n+sod(n) for n = 164721904994 and 164721905012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86694790 + ... + 86696689.

It is an arithmetic number, because the mean of its divisors is an integer number (13437839700).

Almost surely, 2^164721905050 is an apocalyptic number.

164721905050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

164721905050 is a deficient number, since it is larger than the sum of its proper divisors (157786247750).

164721905050 is a wasteful number, since it uses less digits than its factorization.

164721905050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173391510 (or 173391505 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 164721905050 in words is "one hundred sixty-four billion, seven hundred twenty-one million, nine hundred five thousand, fifty".