120991957525 has 12 divisors (see below), whose sum is σ = 150316907872. Its totient is φ = 96608481840.

The previous prime is 120991957523. The next prime is 120991957529. The reversal of 120991957525 is 525759199021.

It is not a de Polignac number, because 120991957525 - 2¹ = 120991957523 is a prime.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120991957523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4613769 + ... + 4639918.

Almost surely, 2^120991957525 is an apocalyptic number.

It is an amenable number.

120991957525 is a deficient number, since it is larger than the sum of its proper divisors (29324950347).

120991957525 is an equidigital number, since it uses as much as digits as its factorization.

120991957525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9254220 (or 9254215 counting only the distinct ones).

The product of its (nonzero) digits is 2551500, while the sum is 55.

The spelling of 120991957525 in words is "one hundred twenty billion, nine hundred ninety-one million, nine hundred fifty-seven thousand, five hundred twenty-five".