11956631642 has 8 divisors (see below), whose sum is σ = 18372385332. Its totient is φ = 5832503200.

The previous prime is 11956631639. The next prime is 11956631783. The reversal of 11956631642 is 24613665911.

11956631642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9268105441 + 2688526201 = 96271^2 + 51851^2 .

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

It is a super-2 number, since 2×11956631642² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11956631593 and 11956631602.

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 3 ways as a sum of consecutive naturals, for example, 72906209 + ... + 72906372.

Almost surely, 2^11956631642 is an apocalyptic number.

11956631642 is a deficient number, since it is larger than the sum of its proper divisors (6415753690).

11956631642 is a wasteful number, since it uses less digits than its factorization.

11956631642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145812624.

The product of its digits is 233280, while the sum is 44.

The spelling of 11956631642 in words is "eleven billion, nine hundred fifty-six million, six hundred thirty-one thousand, six hundred forty-two".