1557483121744 has 80 divisors (see below), whose sum is σ = 3399654265344. Its totient is φ = 684805593600.

The previous prime is 1557483121729. The next prime is 1557483121769. The reversal of 1557483121744 is 4471213847551.

It is a junction number, because it is equal to n+sod(n) for n = 1557483121691 and 1557483121700.

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, 12448362 + ... + 12572854.

Almost surely, 2^{1557483121744} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1557483121744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1699827132672).

1557483121744 is an abundant number, since it is smaller than the sum of its proper divisors (1842171143600).

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

1557483121744 is a wasteful number, since it uses less digits than its factorization.

1557483121744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126836 (or 126830 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 52.

The spelling of 1557483121744 in words is "one trillion, five hundred fifty-seven billion, four hundred eighty-three million, one hundred twenty-one thousand, seven hundred forty-four".