15917120138420 has 48 divisors (see below), whose sum is σ = 35185579141440. Its totient is φ = 6031688011776.

The previous prime is 15917120138329. The next prime is 15917120138443. The reversal of 15917120138420 is 2483102171951.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54179444 + ... + 54472436.

It is an arithmetic number, because the mean of its divisors is an integer number (733032898780).

Almost surely, 2^{15917120138420} is an apocalyptic number.

15917120138420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15917120138420 is an abundant number, since it is smaller than the sum of its proper divisors (19268459003020).

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

15917120138420 is a wasteful number, since it uses less digits than its factorization.

15917120138420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435984 (or 435982 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 15917120138420 in words is "fifteen trillion, nine hundred seventeen billion, one hundred twenty million, one hundred thirty-eight thousand, four hundred twenty".