172661990004 has 36 divisors (see below), whose sum is σ = 498801305184. Its totient is φ = 49331997072.

The previous prime is 172661989993. The next prime is 172661990023. The reversal of 172661990004 is 400099166271.

172661990004 is a `hidden beast` number, since 1 + 7 + 26 + 619 + 9 + 0 + 0 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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, 342583062 + ... + 342583565.

Almost surely, 2^172661990004 is an apocalyptic number.

172661990004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

172661990004 is an abundant number, since it is smaller than the sum of its proper divisors (326139315180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172661990004 is a wasteful number, since it uses less digits than its factorization.

172661990004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685166644 (or 685166639 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 172661990004 in words is "one hundred seventy-two billion, six hundred sixty-one million, nine hundred ninety thousand, four".