11961660993 has 16 divisors (see below), whose sum is σ = 16110407040. Its totient is φ = 7893742464.

The previous prime is 11961660973. The next prime is 11961661031. The reversal of 11961660993 is 39906616911.

It is not a de Polignac number, because 11961660993 - 2²⁴ = 11944883777 is a prime.

It is a super-2 number, since 2×11961660993² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11961660973) 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, 905923 + ... + 919031.

It is an arithmetic number, because the mean of its divisors is an integer number (1006900440).

Almost surely, 2^11961660993 is an apocalyptic number.

It is an amenable number.

11961660993 is a deficient number, since it is larger than the sum of its proper divisors (4148746047).

11961660993 is a wasteful number, since it uses less digits than its factorization.

11961660993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16168.

The product of its (nonzero) digits is 472392, while the sum is 51.

The spelling of 11961660993 in words is "eleven billion, nine hundred sixty-one million, six hundred sixty thousand, nine hundred ninety-three".