661633674 has 32 divisors (see below), whose sum is σ = 1426064640. Its totient is φ = 203435712.

The previous prime is 661633673. The next prime is 661633697. The reversal of 661633674 is 476336166.

It is not an unprimeable number, because it can be changed into a prime (661633673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176532 + ... + 180240.

It is an arithmetic number, because the mean of its divisors is an integer number (44564520).

Almost surely, 2^661633674 is an apocalyptic number.

661633674 is an abundant number, since it is smaller than the sum of its proper divisors (764430966).

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

661633674 is a wasteful number, since it uses less digits than its factorization.

661633674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014.

The product of its digits is 326592, while the sum is 42.

The square root of 661633674 is about 25722.2408432858. The cubic root of 661633674 is about 871.3765472097.

The spelling of 661633674 in words is "six hundred sixty-one million, six hundred thirty-three thousand, six hundred seventy-four".