1557421976139 has 8 divisors (see below), whose sum is σ = 2076570800640. Its totient is φ = 1038277234536.

The previous prime is 1557421976063. The next prime is 1557421976141. The reversal of 1557421976139 is 9316791247551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1557421976139 - 2²⁵ = 1557388421707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1557421976179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21294 + ... + 1765020.

It is an arithmetic number, because the mean of its divisors is an integer number (259571350080).

Almost surely, 2^{1557421976139} is an apocalyptic number.

1557421976139 is a deficient number, since it is larger than the sum of its proper divisors (519148824501).

1557421976139 is a wasteful number, since it uses less digits than its factorization.

1557421976139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041449.

The product of its digits is 14288400, while the sum is 60.

The spelling of 1557421976139 in words is "one trillion, five hundred fifty-seven billion, four hundred twenty-one million, nine hundred seventy-six thousand, one hundred thirty-nine".