656623723 has 16 divisors (see below), whose sum is σ = 756152320. Its totient is φ = 558544896.

The previous prime is 656623673. The next prime is 656623729. The reversal of 656623723 is 327326656.

It is a happy number.

It is not a de Polignac number, because 656623723 - 2⁹ = 656623211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656623729) 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, 853483 + ... + 854251.

It is an arithmetic number, because the mean of its divisors is an integer number (47259520).

Almost surely, 2^656623723 is an apocalyptic number.

656623723 is a deficient number, since it is larger than the sum of its proper divisors (99528597).

656623723 is a wasteful number, since it uses less digits than its factorization.

656623723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546.

The product of its digits is 272160, while the sum is 40.

The square root of 656623723 is about 25624.6702027558. The cubic root of 656623723 is about 869.1715913276.

The spelling of 656623723 in words is "six hundred fifty-six million, six hundred twenty-three thousand, seven hundred twenty-three".