11758165778 has 4 divisors (see below), whose sum is σ = 17637248670. Its totient is φ = 5879082888.

The previous prime is 11758165759. The next prime is 11758165807. The reversal of 11758165778 is 87756185711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87756185711 = 37 ⋅2371788803.

It can be written as a sum of positive squares in only one way, i.e., 9258865729 + 2499300049 = 96223^2 + 49993^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2939541443 + ... + 2939541446.

Almost surely, 2^11758165778 is an apocalyptic number.

11758165778 is a deficient number, since it is larger than the sum of its proper divisors (5879082892).

11758165778 is an equidigital number, since it uses as much as digits as its factorization.

11758165778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5879082891.

The product of its digits is 3292800, while the sum is 56.

The spelling of 11758165778 in words is "eleven billion, seven hundred fifty-eight million, one hundred sixty-five thousand, seven hundred seventy-eight".