1951239648972 has 18 divisors (see below), whose sum is σ = 4552903805044. Its totient is φ = 650411603360.

The previous prime is 1951239648929. The next prime is 1951239649001. The reversal of 1951239648972 is 2798469321591.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4637272 + ... + 5040512.

Almost surely, 2^{1951239648972} is an apocalyptic number.

1951239648972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1951239648972 is an abundant number, since it is smaller than the sum of its proper divisors (2601664156072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1951239648972 is an frugal number, since it uses more digits than its factorization.

1951239648972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806489 (or 403246 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 66.

The spelling of 1951239648972 in words is "one trillion, nine hundred fifty-one billion, two hundred thirty-nine million, six hundred forty-eight thousand, nine hundred seventy-two".