1557794118172 has 12 divisors (see below), whose sum is σ = 2792630919456. Its totient is φ = 759899569760.

The previous prime is 1557794118163. The next prime is 1557794118197. The reversal of 1557794118172 is 2718114977551.

It is a super-2 number, since 2×1557794118172² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4749372148 + ... + 4749372475.

It is an arithmetic number, because the mean of its divisors is an integer number (232719243288).

Almost surely, 2^{1557794118172} is an apocalyptic number.

It is an amenable number.

1557794118172 is a deficient number, since it is larger than the sum of its proper divisors (1234836801284).

1557794118172 is a wasteful number, since it uses less digits than its factorization.

1557794118172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9498744668 (or 9498744666 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 58.

The spelling of 1557794118172 in words is "one trillion, five hundred fifty-seven billion, seven hundred ninety-four million, one hundred eighteen thousand, one hundred seventy-two".