12155607620 has 48 divisors (see below), whose sum is σ = 27589780848. Its totient is φ = 4471994880.

The previous prime is 12155607619. The next prime is 12155607649. The reversal of 12155607620 is 2670655121.

It can be written as a sum of positive squares in 8 ways, for example, as 6690258436 + 5465349184 = 81794^2 + 73928^2 .

It is a super-2 number, since 2×12155607620² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12371 + ... + 156410.

It is an arithmetic number, because the mean of its divisors is an integer number (574787101).

Almost surely, 2^12155607620 is an apocalyptic number.

12155607620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155607620 is an abundant number, since it is smaller than the sum of its proper divisors (15434173228).

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

12155607620 is a wasteful number, since it uses less digits than its factorization.

12155607620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169080 (or 169078 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 12155607620 in words is "twelve billion, one hundred fifty-five million, six hundred seven thousand, six hundred twenty".