656006515551 has 40 divisors (see below), whose sum is σ = 986130097920. Its totient is φ = 434587702032.

The previous prime is 656006515543. The next prime is 656006515561. The reversal of 656006515551 is 155515600656.

656006515551 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 656006515551 - 2³ = 656006515543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 656006515497 and 656006515506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656006515561) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21544800 + ... + 21575226.

It is an arithmetic number, because the mean of its divisors is an integer number (24653252448).

Almost surely, 2^656006515551 is an apocalyptic number.

656006515551 is a deficient number, since it is larger than the sum of its proper divisors (330123582369).

656006515551 is a wasteful number, since it uses less digits than its factorization.

656006515551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32105 (or 32096 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 656006515551 in words is "six hundred fifty-six billion, six million, five hundred fifteen thousand, five hundred fifty-one".