656417423 has 2 divisors, whose sum is σ = 656417424. Its totient is φ = 656417422.

The previous prime is 656417417. The next prime is 656417431. The reversal of 656417423 is 324714656.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656417423 - 2²² = 652223119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656417323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328208711 + 328208712.

It is an arithmetic number, because the mean of its divisors is an integer number (328208712).

Almost surely, 2^656417423 is an apocalyptic number.

656417423 is a deficient number, since it is larger than the sum of its proper divisors (1).

656417423 is an equidigital number, since it uses as much as digits as its factorization.

656417423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 38.

The square root of 656417423 is about 25620.6444688653. The cubic root of 656417423 is about 869.0805554852.

The spelling of 656417423 in words is "six hundred fifty-six million, four hundred seventeen thousand, four hundred twenty-three".