11956865406 has 16 divisors (see below), whose sum is σ = 24150501648. Its totient is φ = 3946160000.

The previous prime is 11956865363. The next prime is 11956865413. The reversal of 11956865406 is 60456865911.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9864795 + ... + 9866006.

It is an arithmetic number, because the mean of its divisors is an integer number (1509406353).

Almost surely, 2^11956865406 is an apocalyptic number.

11956865406 is an abundant number, since it is smaller than the sum of its proper divisors (12193636242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11956865406 is a wasteful number, since it uses less digits than its factorization.

11956865406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19730907.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 11956865406 in words is "eleven billion, nine hundred fifty-six million, eight hundred sixty-five thousand, four hundred six".