656161211005 has 8 divisors (see below), whose sum is σ = 787398686424. Its totient is φ = 524925480000.

The previous prime is 656161210961. The next prime is 656161211023. The reversal of 656161211005 is 500112161656.

It can be written as a sum of positive squares in 4 ways, for example, as 22756929316 + 633404281689 = 150854^2 + 795867^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656161211005 - 2¹⁵ = 656161178237 is a prime.

It is a super-2 number, since 2×656161211005² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 627055 + ... + 1305955.

It is an arithmetic number, because the mean of its divisors is an integer number (98424835803).

Almost surely, 2^656161211005 is an apocalyptic number.

It is an amenable number.

656161211005 is a deficient number, since it is larger than the sum of its proper divisors (131237475419).

656161211005 is a wasteful number, since it uses less digits than its factorization.

656161211005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872207.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 656161211005 in words is "six hundred fifty-six billion, one hundred sixty-one million, two hundred eleven thousand, five".