1557142512420 has 48 divisors (see below), whose sum is σ = 4756362585408. Its totient is φ = 377489093760.

The previous prime is 1557142512403. The next prime is 1557142512469. The reversal of 1557142512420 is 242152417551.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1179652759 + ... + 1179654078.

It is an arithmetic number, because the mean of its divisors is an integer number (99090887196).

Almost surely, 2^{1557142512420} is an apocalyptic number.

1557142512420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1557142512420 is an abundant number, since it is smaller than the sum of its proper divisors (3199220072988).

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

1557142512420 is a wasteful number, since it uses less digits than its factorization.

1557142512420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359306860 (or 2359306858 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 39.

Adding to 1557142512420 its reverse (242152417551), we get a palindrome (1799294929971).

The spelling of 1557142512420 in words is "one trillion, five hundred fifty-seven billion, one hundred forty-two million, five hundred twelve thousand, four hundred twenty".