661157874 has 24 divisors (see below), whose sum is σ = 1542702252. Its totient is φ = 203433120.

The previous prime is 661157867. The next prime is 661157909. The reversal of 661157874 is 478751166.

661157874 is a `hidden beast` number, since 6 + 6 + 1 + 1 + 578 + 74 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 660849849 + 308025 = 25707^2 + 555^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1412497 + ... + 1412964.

Almost surely, 2^661157874 is an apocalyptic number.

661157874 is an abundant number, since it is smaller than the sum of its proper divisors (881544378).

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

661157874 is a wasteful number, since it uses less digits than its factorization.

661157874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825482 (or 2825479 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 661157874 is about 25712.9903745169. The cubic root of 661157874 is about 871.1676197215.

The spelling of 661157874 in words is "six hundred sixty-one million, one hundred fifty-seven thousand, eight hundred seventy-four".