11891399278 has 8 divisors (see below), whose sum is σ = 19458653400. Its totient is φ = 5405181480.

The previous prime is 11891399263. The next prime is 11891399291. The reversal of 11891399278 is 87299319811.

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

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, 270259053 + ... + 270259096.

It is an arithmetic number, because the mean of its divisors is an integer number (2432331675).

Almost surely, 2^11891399278 is an apocalyptic number.

11891399278 is a deficient number, since it is larger than the sum of its proper divisors (7567254122).

11891399278 is a wasteful number, since it uses less digits than its factorization.

11891399278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540518162.

The product of its digits is 1959552, while the sum is 58.

The spelling of 11891399278 in words is "eleven billion, eight hundred ninety-one million, three hundred ninety-nine thousand, two hundred seventy-eight".