11775538491 has 8 divisors (see below), whose sum is σ = 15704572224. Its totient is φ = 7848431880.

The previous prime is 11775538483. The next prime is 11775538507. The reversal of 11775538491 is 19483557711.

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

It is not a de Polignac number, because 11775538491 - 2³ = 11775538483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11775538441) 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, 467461 + ... + 492006.

It is an arithmetic number, because the mean of its divisors is an integer number (1963071528).

Almost surely, 2^11775538491 is an apocalyptic number.

11775538491 is a deficient number, since it is larger than the sum of its proper divisors (3929033733).

11775538491 is an equidigital number, since it uses as much as digits as its factorization.

11775538491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963561.

The product of its digits is 1058400, while the sum is 51.

The spelling of 11775538491 in words is "eleven billion, seven hundred seventy-five million, five hundred thirty-eight thousand, four hundred ninety-one".