661012574 has 12 divisors (see below), whose sum is σ = 998285064. Its totient is φ = 328266072.

The previous prime is 661012567. The next prime is 661012601. The reversal of 661012574 is 475210166.

It is a super-2 number, since 2×661012574² = 873875245972210952, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661012574.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36959 + ... + 51845.

It is an arithmetic number, because the mean of its divisors is an integer number (83190422).

Almost surely, 2^661012574 is an apocalyptic number.

661012574 is a deficient number, since it is larger than the sum of its proper divisors (337272490).

661012574 is a wasteful number, since it uses less digits than its factorization.

661012574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15187 (or 15038 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 661012574 is about 25710.1647991607. The cubic root of 661012574 is about 871.1037973810.

The spelling of 661012574 in words is "six hundred sixty-one million, twelve thousand, five hundred seventy-four".