12655998780 has 48 divisors (see below), whose sum is σ = 35498309280. Its totient is φ = 3369074688.

The previous prime is 12655998769. The next prime is 12655998787. The reversal of 12655998780 is 8789955621.

It is a super-2 number, since 2×12655998780² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12655998787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148165 + ... + 217404.

It is an arithmetic number, because the mean of its divisors is an integer number (739548110).

Almost surely, 2^12655998780 is an apocalyptic number.

12655998780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12655998780 is an abundant number, since it is smaller than the sum of its proper divisors (22842310500).

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

12655998780 is a wasteful number, since it uses less digits than its factorization.

12655998780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366158 (or 366156 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 12655998780 in words is "twelve billion, six hundred fifty-five million, nine hundred ninety-eight thousand, seven hundred eighty".