12635973992 has 8 divisors (see below), whose sum is σ = 23692451250. Its totient is φ = 6317986992.

The previous prime is 12635973949. The next prime is 12635974031. The reversal of 12635973992 is 29937953621.

It can be written as a sum of positive squares in only one way, i.e., 8214521956 + 4421452036 = 90634^2 + 66494^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 789748367 + ... + 789748382.

Almost surely, 2^12635973992 is an apocalyptic number.

It is an amenable number.

12635973992 is a deficient number, since it is larger than the sum of its proper divisors (11056477258).

12635973992 is a wasteful number, since it uses less digits than its factorization.

12635973992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579496755 (or 1579496751 counting only the distinct ones).

The product of its digits is 5511240, while the sum is 56.

The spelling of 12635973992 in words is "twelve billion, six hundred thirty-five million, nine hundred seventy-three thousand, nine hundred ninety-two".