1157257566 has 48 divisors (see below), whose sum is σ = 2554297200. Its totient is φ = 378601344.

The previous prime is 1157257561. The next prime is 1157257573. The reversal of 1157257566 is 6657527511.

1157257566 is a `hidden beast` number, since 1 + 1 + 5 + 72 + 575 + 6 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157257561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220080 + ... + 225276.

It is an arithmetic number, because the mean of its divisors is an integer number (53214525).

Almost surely, 2^1157257566 is an apocalyptic number.

1157257566 is an abundant number, since it is smaller than the sum of its proper divisors (1397039634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1157257566 is a wasteful number, since it uses less digits than its factorization.

1157257566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433 (or 5430 counting only the distinct ones).

The product of its digits is 441000, while the sum is 45.

The square root of 1157257566 is about 34018.4885907649. The cubic root of 1157257566 is about 1049.8888970879. Note that the first 4 decimals are identical.

The spelling of 1157257566 in words is "one billion, one hundred fifty-seven million, two hundred fifty-seven thousand, five hundred sixty-six".