11861872478 has 8 divisors (see below), whose sum is σ = 18566409168. Its totient is φ = 5673069424.

The previous prime is 11861872469. The next prime is 11861872487. The reversal of 11861872478 is 87427816811.

It is an interprime number because it is at equal distance from previous prime (11861872469) and next prime (11861872487).

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, 128933351 + ... + 128933442.

It is an arithmetic number, because the mean of its divisors is an integer number (2320801146).

Almost surely, 2^11861872478 is an apocalyptic number.

11861872478 is a deficient number, since it is larger than the sum of its proper divisors (6704536690).

11861872478 is a wasteful number, since it uses less digits than its factorization.

11861872478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257866818.

The product of its digits is 1204224, while the sum is 53.

The spelling of 11861872478 in words is "eleven billion, eight hundred sixty-one million, eight hundred seventy-two thousand, four hundred seventy-eight".