15597761880 has 128 divisors (see below), whose sum is σ = 49099115520. Its totient is φ = 3956451840.

The previous prime is 15597761863. The next prime is 15597761899. The reversal of 15597761880 is 8816779551.

It is a Cunningham number, because it is equal to 124891²-1.

It is a super-2 number, since 2×15597761880² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15597761880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 483949 + ... + 515171.

It is an arithmetic number, because the mean of its divisors is an integer number (383586840).

Almost surely, 2^15597761880 is an apocalyptic number.

15597761880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15597761880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24549557760).

15597761880 is an abundant number, since it is smaller than the sum of its proper divisors (33501353640).

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

15597761880 is a wasteful number, since it uses less digits than its factorization.

15597761880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31441 (or 31437 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 57.

The spelling of 15597761880 in words is "fifteen billion, five hundred ninety-seven million, seven hundred sixty-one thousand, eight hundred eighty".