661727674 has 16 divisors (see below), whose sum is σ = 1030288896. Its totient is φ = 318416400.

The previous prime is 661727653. The next prime is 661727681. The reversal of 661727674 is 476727166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18262 + ... + 40705.

It is an arithmetic number, because the mean of its divisors is an integer number (64393056).

Almost surely, 2^661727674 is an apocalyptic number.

661727674 is a deficient number, since it is larger than the sum of its proper divisors (368561222).

661727674 is a wasteful number, since it uses less digits than its factorization.

661727674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59181.

The product of its digits is 592704, while the sum is 46.

The square root of 661727674 is about 25724.0679908913. The cubic root of 661727674 is about 871.4178114923.

The spelling of 661727674 in words is "six hundred sixty-one million, seven hundred twenty-seven thousand, six hundred seventy-four".