656670216565 has 16 divisors (see below), whose sum is σ = 859723629696. Its totient is φ = 477532440000.

The previous prime is 656670216539. The next prime is 656670216569. The reversal of 656670216565 is 565612076656.

It is not a de Polignac number, because 656670216565 - 2⁷ = 656670216437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656670216569) 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, 9064 + ... + 1146046.

It is an arithmetic number, because the mean of its divisors is an integer number (53732726856).

Almost surely, 2^656670216565 is an apocalyptic number.

It is an amenable number.

656670216565 is a deficient number, since it is larger than the sum of its proper divisors (203053413131).

656670216565 is a wasteful number, since it uses less digits than its factorization.

656670216565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147500.

The product of its (nonzero) digits is 13608000, while the sum is 55.

The spelling of 656670216565 in words is "six hundred fifty-six billion, six hundred seventy million, two hundred sixteen thousand, five hundred sixty-five".