157566214557 has 12 divisors (see below), whose sum is σ = 227599221564. Its totient is φ = 105042491520.

The previous prime is 157566214549. The next prime is 157566214591. The reversal of 157566214557 is 755412665751.

157566214557 is a `hidden beast` number, since 1 + 5 + 7 + 5 + 6 + 621 + 4 + 5 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28813704516 + 128752510041 = 169746^2 + 358821^2 .

It is not a de Polignac number, because 157566214557 - 2³ = 157566214549 is a prime.

It is a super-2 number, since 2×157566214557² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157566214537) 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, 810103 + ... + 985595.

It is an arithmetic number, because the mean of its divisors is an integer number (18966601797).

Almost surely, 2^157566214557 is an apocalyptic number.

It is an amenable number.

157566214557 is a deficient number, since it is larger than the sum of its proper divisors (70033007007).

157566214557 is a wasteful number, since it uses less digits than its factorization.

157566214557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275260 (or 275257 counting only the distinct ones).

The product of its digits is 8820000, while the sum is 54.

The spelling of 157566214557 in words is "one hundred fifty-seven billion, five hundred sixty-six million, two hundred fourteen thousand, five hundred fifty-seven".