11566987949 has 8 divisors (see below), whose sum is σ = 12622592448. Its totient is φ = 10512060160.

The previous prime is 11566987931. The next prime is 11566987963. The reversal of 11566987949 is 94978966511.

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

It is a cyclic number.

It is not a de Polignac number, because 11566987949 - 2²⁰ = 11565939373 is a prime.

It is a super-2 number, since 2×11566987949² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11566987909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133097 + ... + 202110.

It is an arithmetic number, because the mean of its divisors is an integer number (1577824056).

Almost surely, 2^11566987949 is an apocalyptic number.

It is an amenable number.

11566987949 is a deficient number, since it is larger than the sum of its proper divisors (1055604499).

11566987949 is a wasteful number, since it uses less digits than its factorization.

11566987949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338355.

The product of its digits is 29393280, while the sum is 65.

The spelling of 11566987949 in words is "eleven billion, five hundred sixty-six million, nine hundred eighty-seven thousand, nine hundred forty-nine".