656215602551 has 4 divisors (see below), whose sum is σ = 656218437504. Its totient is φ = 656212767600.

The previous prime is 656215602407. The next prime is 656215602607. The reversal of 656215602551 is 155206512656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656215602551 - 2¹⁴ = 656215586167 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 (656215601551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036055 + ... + 1544616.

It is an arithmetic number, because the mean of its divisors is an integer number (164054609376).

Almost surely, 2^656215602551 is an apocalyptic number.

656215602551 is a deficient number, since it is larger than the sum of its proper divisors (2834953).

656215602551 is a wasteful number, since it uses less digits than its factorization.

656215602551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834952.

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 656215602551 in words is "six hundred fifty-six billion, two hundred fifteen million, six hundred two thousand, five hundred fifty-one".