15991312132 has 12 divisors (see below), whose sum is σ = 28004146240. Its totient is φ = 7990127496.

The previous prime is 15991312121. The next prime is 15991312147. The reversal of 15991312132 is 23121319951.

It is a junction number, because it is equal to n+sod(n) for n = 15991312091 and 15991312100.

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, 1375632 + ... + 1387207.

Almost surely, 2^15991312132 is an apocalyptic number.

It is an amenable number.

15991312132 is a deficient number, since it is larger than the sum of its proper divisors (12012834108).

15991312132 is a wasteful number, since it uses less digits than its factorization.

15991312132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764290 (or 2764288 counting only the distinct ones).

The product of its digits is 14580, while the sum is 37.

The spelling of 15991312132 in words is "fifteen billion, nine hundred ninety-one million, three hundred twelve thousand, one hundred thirty-two".