11761657991 has 8 divisors (see below), whose sum is σ = 11823984000. Its totient is φ = 11699364600.

The previous prime is 11761657949. The next prime is 11761658039. The reversal of 11761657991 is 19975616711.

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 11761657991 - 2¹⁰ = 11761656967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11761657931) 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, 1119320 + ... + 1129778.

It is an arithmetic number, because the mean of its divisors is an integer number (1477998000).

Almost surely, 2^11761657991 is an apocalyptic number.

11761657991 is a deficient number, since it is larger than the sum of its proper divisors (62326009).

11761657991 is a wasteful number, since it uses less digits than its factorization.

11761657991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16309.

The product of its digits is 714420, while the sum is 53.

The spelling of 11761657991 in words is "eleven billion, seven hundred sixty-one million, six hundred fifty-seven thousand, nine hundred ninety-one".