656644742 has 16 divisors (see below), whose sum is σ = 1062914832. Its totient is φ = 302443680.

The previous prime is 656644741. The next prime is 656644783. The reversal of 656644742 is 247446656.

It is a junction number, because it is equal to n+sod(n) for n = 656644693 and 656644702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656644741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12953 + ... + 38484.

It is an arithmetic number, because the mean of its divisors is an integer number (66432177).

Almost surely, 2^656644742 is an apocalyptic number.

656644742 is a deficient number, since it is larger than the sum of its proper divisors (406270090).

656644742 is a wasteful number, since it uses less digits than its factorization.

656644742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51943.

The product of its digits is 967680, while the sum is 44.

The square root of 656644742 is about 25625.0803315814. The cubic root of 656644742 is about 869.1808654989.

The spelling of 656644742 in words is "six hundred fifty-six million, six hundred forty-four thousand, seven hundred forty-two".