656023693 has 12 divisors (see below), whose sum is σ = 752158548. Its totient is φ = 569936640.

The previous prime is 656023681. The next prime is 656023699. The reversal of 656023693 is 396320656.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 16793604 + 639230089 = 4098^2 + 25283^2 .

It is a de Polignac number, because none of the positive numbers 2^k-656023693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656023699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111298 + ... + 117043.

It is an arithmetic number, because the mean of its divisors is an integer number (62679879).

Almost surely, 2^656023693 is an apocalyptic number.

It is an amenable number.

656023693 is a deficient number, since it is larger than the sum of its proper divisors (96134855).

656023693 is a wasteful number, since it uses less digits than its factorization.

656023693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228384 (or 228371 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 40.

The square root of 656023693 is about 25612.9594736727. The cubic root of 656023693 is about 868.9067577798.

The spelling of 656023693 in words is "six hundred fifty-six million, twenty-three thousand, six hundred ninety-three".