11775451511 has 4 divisors (see below), whose sum is σ = 11775675792. Its totient is φ = 11775227232.

The previous prime is 11775451481. The next prime is 11775451517. The reversal of 11775451511 is 11515457711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11515457711 = 53 ⋅217272787.

It is a cyclic number.

It is not a de Polignac number, because 11775451511 - 2¹⁸ = 11775189367 is a prime.

It is a super-2 number, since 2×11775451511² (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 (11775451517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13646 + ... + 154068.

It is an arithmetic number, because the mean of its divisors is an integer number (2943918948).

Almost surely, 2^11775451511 is an apocalyptic number.

11775451511 is a deficient number, since it is larger than the sum of its proper divisors (224281).

11775451511 is an equidigital number, since it uses as much as digits as its factorization.

11775451511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224280.

The product of its digits is 24500, while the sum is 38.

The spelling of 11775451511 in words is "eleven billion, seven hundred seventy-five million, four hundred fifty-one thousand, five hundred eleven".