121516755625 has 10 divisors (see below), whose sum is σ = 151847338610. Its totient is φ = 97213404000.

The previous prime is 121516755611. The next prime is 121516755641. The reversal of 121516755625 is 526557615121.

It can be written as a sum of positive squares in 5 ways, for example, as 71849730304 + 49667025321 = 268048^2 + 222861^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121516755625 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 97212780 + ... + 97214029.

It is an arithmetic number, because the mean of its divisors is an integer number (15184733861).

Almost surely, 2^121516755625 is an apocalyptic number.

It is an amenable number.

121516755625 is a deficient number, since it is larger than the sum of its proper divisors (30330582985).

121516755625 is an frugal number, since it uses more digits than its factorization.

121516755625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194426829 (or 194426814 counting only the distinct ones).

The product of its digits is 630000, while the sum is 46.

The spelling of 121516755625 in words is "one hundred twenty-one billion, five hundred sixteen million, seven hundred fifty-five thousand, six hundred twenty-five".