797239987551 has 24 divisors (see below), whose sum is σ = 1316223136800. Its totient is φ = 455515713216.

The previous prime is 797239987529. The next prime is 797239987553. The reversal of 797239987551 is 155789932797.

It is not a de Polignac number, because 797239987551 - 2³⁴ = 780060118367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 797239987551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (797239987553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111876 + ... + 1267673.

It is an arithmetic number, because the mean of its divisors is an integer number (54842630700).

Almost surely, 2^797239987551 is an apocalyptic number.

797239987551 is a deficient number, since it is larger than the sum of its proper divisors (518983149249).

797239987551 is a wasteful number, since it uses less digits than its factorization.

797239987551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388735 (or 1388732 counting only the distinct ones).

The product of its digits is 300056400, while the sum is 72.

The spelling of 797239987551 in words is "seven hundred ninety-seven billion, two hundred thirty-nine million, nine hundred eighty-seven thousand, five hundred fifty-one".