11956533699 has 16 divisors (see below), whose sum is σ = 17430076800. Its totient is φ = 7230236160.

The previous prime is 11956533697. The next prime is 11956533703. The reversal of 11956533699 is 99633565911.

It is not a de Polignac number, because 11956533699 - 2¹ = 11956533697 is a prime.

It is a super-4 number, since 4×11956533699⁴ (a number of 41 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (11956533697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388657 + ... + 418290.

It is an arithmetic number, because the mean of its divisors is an integer number (1089379800).

Almost surely, 2^11956533699 is an apocalyptic number.

11956533699 is a deficient number, since it is larger than the sum of its proper divisors (5473543101).

11956533699 is a wasteful number, since it uses less digits than its factorization.

11956533699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807410.

The product of its digits is 5904900, while the sum is 57.

The spelling of 11956533699 in words is "eleven billion, nine hundred fifty-six million, five hundred thirty-three thousand, six hundred ninety-nine".