656461630509 has 16 divisors (see below), whose sum is σ = 877349560320. Its totient is φ = 436607895920.

The previous prime is 656461630507. The next prime is 656461630519. The reversal of 656461630509 is 905036164656.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 656461630509 - 2¹ = 656461630507 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656461630507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5352544 + ... + 5473814.

It is an arithmetic number, because the mean of its divisors is an integer number (54834347520).

Almost surely, 2^656461630509 is an apocalyptic number.

It is an amenable number.

656461630509 is a deficient number, since it is larger than the sum of its proper divisors (220887929811).

656461630509 is a wasteful number, since it uses less digits than its factorization.

656461630509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125520.

The product of its (nonzero) digits is 3499200, while the sum is 51.

The spelling of 656461630509 in words is "six hundred fifty-six billion, four hundred sixty-one million, six hundred thirty thousand, five hundred nine".