121655115225 has 72 divisors (see below), whose sum is σ = 249171508352. Its totient is φ = 55581292800.

The previous prime is 121655115209. The next prime is 121655115247. The reversal of 121655115225 is 522511556121.

121655115225 is a `hidden beast` number, since 1 + 21 + 65 + 51 + 1 + 522 + 5 = 666.

It is not a de Polignac number, because 121655115225 - 2⁴ = 121655115209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121655115225.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2786565 + ... + 2829885.

Almost surely, 2^121655115225 is an apocalyptic number.

121655115225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121655115225 is an abundant number, since it is smaller than the sum of its proper divisors (127516393127).

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

121655115225 is a wasteful number, since it uses less digits than its factorization.

121655115225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45127 (or 45119 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The spelling of 121655115225 in words is "one hundred twenty-one billion, six hundred fifty-five million, one hundred fifteen thousand, two hundred twenty-five".