120997857105 has 20 divisors (see below), whose sum is σ = 216899863092. Its totient is φ = 64532190240.

The previous prime is 120997857091. The next prime is 120997857109. The reversal of 120997857105 is 501758799021.

It can be written as a sum of positive squares in 2 ways, for example, as 28640823696 + 92357033409 = 169236^2 + 303903^2 .

It is not a de Polignac number, because 120997857105 - 2⁴ = 120997857089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (120997857109) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 149379666 + ... + 149380475.

Almost surely, 2^120997857105 is an apocalyptic number.

120997857105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120997857105 is a deficient number, since it is larger than the sum of its proper divisors (95902005987).

120997857105 is an equidigital number, since it uses as much as digits as its factorization.

120997857105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298760158 (or 298760149 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 54.

The spelling of 120997857105 in words is "one hundred twenty billion, nine hundred ninety-seven million, eight hundred fifty-seven thousand, one hundred five".