120990399977 has 4 divisors (see below), whose sum is σ = 121791661056. Its totient is φ = 120189138900.

The previous prime is 120990399973. The next prime is 120990400021. The reversal of 120990399977 is 779993099021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 779993099021 = 225613 ⋅3457217.

It is a cyclic number.

It is not a de Polignac number, because 120990399977 - 2² = 120990399973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120990399973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400630313 + ... + 400630614.

It is an arithmetic number, because the mean of its divisors is an integer number (30447915264).

Almost surely, 2^120990399977 is an apocalyptic number.

It is an amenable number.

120990399977 is a deficient number, since it is larger than the sum of its proper divisors (801261079).

120990399977 is an equidigital number, since it uses as much as digits as its factorization.

120990399977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801261078.

The product of its (nonzero) digits is 17360406, while the sum is 65.

The spelling of 120990399977 in words is "one hundred twenty billion, nine hundred ninety million, three hundred ninety-nine thousand, nine hundred seventy-seven".