121551766720 has 56 divisors (see below), whose sum is σ = 292255370784. Its totient is φ = 48148647936.

The previous prime is 121551766673. The next prime is 121551766753. The reversal of 121551766720 is 27667155121.

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, 1810969 + ... + 1876888.

Almost surely, 2^121551766720 is an apocalyptic number.

121551766720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121551766720 is an abundant number, since it is smaller than the sum of its proper divisors (170703604064).

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

121551766720 is a wasteful number, since it uses less digits than its factorization.

121551766720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687977 (or 3687967 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 121551766720 in words is "one hundred twenty-one billion, five hundred fifty-one million, seven hundred sixty-six thousand, seven hundred twenty".