788722381521 has 12 divisors (see below), whose sum is σ = 1139274128772. Its totient is φ = 525811013376.

The previous prime is 788722381487. The next prime is 788722381523. The reversal of 788722381521 is 125183227887.

It is a happy number.

788722381521 is a `hidden beast` number, since 7 + 8 + 87 + 2 + 2 + 38 + 1 + 521 = 666.

788722381521 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 737606145600 + 51116235921 = 858840^2 + 226089^2 .

It is not a de Polignac number, because 788722381521 - 2¹⁹ = 788721857233 is a prime.

It is a super-3 number, since 3×788722381521³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (788722381523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1479145 + ... + 1940441.

It is an arithmetic number, because the mean of its divisors is an integer number (94939510731).

Almost surely, 2^788722381521 is an apocalyptic number.

It is an amenable number.

788722381521 is a deficient number, since it is larger than the sum of its proper divisors (350551747251).

788722381521 is a wasteful number, since it uses less digits than its factorization.

788722381521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651280 (or 651277 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The spelling of 788722381521 in words is "seven hundred eighty-eight billion, seven hundred twenty-two million, three hundred eighty-one thousand, five hundred twenty-one".