11857551878 has 8 divisors (see below), whose sum is σ = 17788426320. Its totient is φ = 5928076440.

The previous prime is 11857551869. The next prime is 11857551887. The reversal of 11857551878 is 87815575811.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11857551869) and next prime (11857551887).

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

It is a super-2 number, since 2×11857551878² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328298 + ... + 362621.

It is an arithmetic number, because the mean of its divisors is an integer number (2223553290).

Almost surely, 2^11857551878 is an apocalyptic number.

11857551878 is a deficient number, since it is larger than the sum of its proper divisors (5930874442).

11857551878 is an equidigital number, since it uses as much as digits as its factorization.

11857551878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699502.

The product of its digits is 3136000, while the sum is 56.

The spelling of 11857551878 in words is "eleven billion, eight hundred fifty-seven million, five hundred fifty-one thousand, eight hundred seventy-eight".