180121605680 has 40 divisors (see below), whose sum is σ = 436990682592. Its totient is φ = 68916091904.

The previous prime is 180121605647. The next prime is 180121605691. The reversal of 180121605680 is 86506121081.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48944249 + ... + 48947928.

Almost surely, 2^180121605680 is an apocalyptic number.

180121605680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180121605680 is an abundant number, since it is smaller than the sum of its proper divisors (256869076912).

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

180121605680 is a wasteful number, since it uses less digits than its factorization.

180121605680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97892213 (or 97892207 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 180121605680 in words is "one hundred eighty billion, one hundred twenty-one million, six hundred five thousand, six hundred eighty".