1557112821117 has 32 divisors (see below), whose sum is σ = 2377648204800. Its totient is φ = 887940413568.

The previous prime is 1557112821113. The next prime is 1557112821157. The reversal of 1557112821117 is 7111282117551.

It is a happy number.

It is not a de Polignac number, because 1557112821117 - 2² = 1557112821113 is a prime.

It is a super-2 number, since 2×1557112821117² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557112821113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42364734 + ... + 42401472.

It is an arithmetic number, because the mean of its divisors is an integer number (74301506400).

Almost surely, 2^{1557112821117} is an apocalyptic number.

It is an amenable number.

1557112821117 is a deficient number, since it is larger than the sum of its proper divisors (820535383683).

1557112821117 is a wasteful number, since it uses less digits than its factorization.

1557112821117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40865.

The product of its digits is 39200, while the sum is 42.

Adding to 1557112821117 its reverse (7111282117551), we get a palindrome (8668394938668).

The spelling of 1557112821117 in words is "one trillion, five hundred fifty-seven billion, one hundred twelve million, eight hundred twenty-one thousand, one hundred seventeen".