656298857901 has 4 divisors (see below), whose sum is σ = 875065143872. Its totient is φ = 437532571932.

The previous prime is 656298857867. The next prime is 656298857911. The reversal of 656298857901 is 109758892656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 656298857901 - 2¹⁷ = 656298726829 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 (656298857911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109383142981 + ... + 109383142986.

It is an arithmetic number, because the mean of its divisors is an integer number (218766285968).

Almost surely, 2^656298857901 is an apocalyptic number.

It is an amenable number.

656298857901 is a deficient number, since it is larger than the sum of its proper divisors (218766285971).

656298857901 is a wasteful number, since it uses less digits than its factorization.

656298857901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218766285970.

The product of its (nonzero) digits is 65318400, while the sum is 66.

The spelling of 656298857901 in words is "six hundred fifty-six billion, two hundred ninety-eight million, eight hundred fifty-seven thousand, nine hundred one".