1557125152181 has 16 divisors (see below), whose sum is σ = 1566369353328. Its totient is φ = 1547915443200.

The previous prime is 1557125152169. The next prime is 1557125152183. The reversal of 1557125152181 is 1812515217551.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 394372696081 + 1162752456100 = 627991^2 + 1078310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1557125152181 - 2¹⁰ = 1557125151157 is a prime.

It is a super-2 number, since 2×1557125152181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557125152183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169598411 + ... + 169607591.

It is an arithmetic number, because the mean of its divisors is an integer number (97898084583).

Almost surely, 2^{1557125152181} is an apocalyptic number.

It is an amenable number.

1557125152181 is a deficient number, since it is larger than the sum of its proper divisors (9244201147).

1557125152181 is an equidigital number, since it uses as much as digits as its factorization.

1557125152181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10952.

The product of its digits is 140000, while the sum is 44.

The spelling of 1557125152181 in words is "one trillion, five hundred fifty-seven billion, one hundred twenty-five million, one hundred fifty-two thousand, one hundred eighty-one".