656551551405 has 16 divisors (see below), whose sum is σ = 1050515919360. Its totient is φ = 350149681728.

The previous prime is 656551551353. The next prime is 656551551431. The reversal of 656551551405 is 504155155656.

656551551405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 656551551405 - 2¹⁷ = 656551420333 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198142 + ... + 1162911.

It is an arithmetic number, because the mean of its divisors is an integer number (65657244960).

Almost surely, 2^656551551405 is an apocalyptic number.

It is an amenable number.

656551551405 is a deficient number, since it is larger than the sum of its proper divisors (393964367955).

656551551405 is a wasteful number, since it uses less digits than its factorization.

656551551405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393220.

The product of its (nonzero) digits is 2250000, while the sum is 48.

The spelling of 656551551405 in words is "six hundred fifty-six billion, five hundred fifty-one million, five hundred fifty-one thousand, four hundred five".