1557133644121 has 12 divisors (see below), whose sum is σ = 1804492090800. Its totient is φ = 1332306858560.

The previous prime is 1557133644067. The next prime is 1557133644133. The reversal of 1557133644121 is 1214463317551.

It is a happy number.

It is not a de Polignac number, because 1557133644121 - 2⁹ = 1557133643609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1557133614121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 244906171 + ... + 244912528.

It is an arithmetic number, because the mean of its divisors is an integer number (150374340900).

Almost surely, 2^{1557133644121} is an apocalyptic number.

1557133644121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1557133644121 is a deficient number, since it is larger than the sum of its proper divisors (247358446679).

1557133644121 is a wasteful number, since it uses less digits than its factorization.

1557133644121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489818744 (or 489818727 counting only the distinct ones).

The product of its digits is 302400, while the sum is 43.

The spelling of 1557133644121 in words is "one trillion, five hundred fifty-seven billion, one hundred thirty-three million, six hundred forty-four thousand, one hundred twenty-one".