11991593601 has 12 divisors (see below), whose sum is σ = 18653590228. Its totient is φ = 7379442144.

The previous prime is 11991593587. The next prime is 11991593629. The reversal of 11991593601 is 10639519911.

It can be written as a sum of positive squares in 2 ways, for example, as 6215745600 + 5775848001 = 78840^2 + 75999^2 .

It is not a de Polignac number, because 11991593601 - 2²² = 11987399297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11991593681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51246010 + ... + 51246243.

Almost surely, 2^11991593601 is an apocalyptic number.

It is an amenable number.

11991593601 is a deficient number, since it is larger than the sum of its proper divisors (6661996627).

11991593601 is a wasteful number, since it uses less digits than its factorization.

11991593601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102492272 (or 102492269 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 45.

The spelling of 11991593601 in words is "eleven billion, nine hundred ninety-one million, five hundred ninety-three thousand, six hundred one".