12157105478 has 32 divisors (see below), whose sum is σ = 20989260864. Its totient is φ = 5173143552.

The previous prime is 12157105463. The next prime is 12157105523. The reversal of 12157105478 is 87450175121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2072726 + ... + 2078582.

It is an arithmetic number, because the mean of its divisors is an integer number (655914402).

Almost surely, 2^12157105478 is an apocalyptic number.

12157105478 is a deficient number, since it is larger than the sum of its proper divisors (8832155386).

12157105478 is a wasteful number, since it uses less digits than its factorization.

12157105478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6896.

The product of its (nonzero) digits is 78400, while the sum is 41.

The spelling of 12157105478 in words is "twelve billion, one hundred fifty-seven million, one hundred five thousand, four hundred seventy-eight".