11701550991 has 8 divisors (see below), whose sum is σ = 16802227120. Its totient is φ = 7200954432.

The previous prime is 11701550981. The next prime is 11701551031. The reversal of 11701550991 is 19905510711.

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

It is not a de Polignac number, because 11701550991 - 2¹⁵ = 11701518223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 300039769 = 11701550991 / (1 + 1 + 7 + 0 + 1 + 5 + 5 + 0 + 9 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11701550981) 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, 150019846 + ... + 150019923.

It is an arithmetic number, because the mean of its divisors is an integer number (2100278390).

Almost surely, 2^11701550991 is an apocalyptic number.

11701550991 is a deficient number, since it is larger than the sum of its proper divisors (5100676129).

11701550991 is a wasteful number, since it uses less digits than its factorization.

11701550991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300039785.

The product of its (nonzero) digits is 14175, while the sum is 39.

The spelling of 11701550991 in words is "eleven billion, seven hundred one million, five hundred fifty thousand, nine hundred ninety-one".