656973923 has 2 divisors, whose sum is σ = 656973924. Its totient is φ = 656973922.

The previous prime is 656973907. The next prime is 656973937. The reversal of 656973923 is 329379656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656973923 - 2⁴ = 656973907 is a prime.

It is a super-2 number, since 2×656973923² = 863229471004019858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656973323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328486961 + 328486962.

It is an arithmetic number, because the mean of its divisors is an integer number (328486962).

Almost surely, 2^656973923 is an apocalyptic number.

656973923 is a deficient number, since it is larger than the sum of its proper divisors (1).

656973923 is an equidigital number, since it uses as much as digits as its factorization.

656973923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 50.

The square root of 656973923 is about 25631.5025505724. The cubic root of 656973923 is about 869.3260835600.

The spelling of 656973923 in words is "six hundred fifty-six million, nine hundred seventy-three thousand, nine hundred twenty-three".