11911291864 has 8 divisors (see below), whose sum is σ = 22333672260. Its totient is φ = 5955645928.

The previous prime is 11911291853. The next prime is 11911291871. The reversal of 11911291864 is 46819211911.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 11911291864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 744455734 + ... + 744455749.

Almost surely, 2^11911291864 is an apocalyptic number.

It is an amenable number.

11911291864 is a deficient number, since it is larger than the sum of its proper divisors (10422380396).

11911291864 is a wasteful number, since it uses less digits than its factorization.

11911291864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488911489 (or 1488911485 counting only the distinct ones).

The product of its digits is 31104, while the sum is 43.

The spelling of 11911291864 in words is "eleven billion, nine hundred eleven million, two hundred ninety-one thousand, eight hundred sixty-four".