12155386320 has 480 divisors, whose sum is σ = 51167510784. Its totient is φ = 2512281600.

The previous prime is 12155386307. The next prime is 12155386333. The reversal of 12155386320 is 2368355121.

12155386320 is a `hidden beast` number, since 1 + 2 + 1 + 553 + 86 + 3 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (12155386307) and next prime (12155386333).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12917050 + ... + 12917990.

Almost surely, 2^12155386320 is an apocalyptic number.

12155386320 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 12155386320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25583755392).

12155386320 is an abundant number, since it is smaller than the sum of its proper divisors (39012124464).

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

12155386320 is a wasteful number, since it uses less digits than its factorization.

12155386320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1202 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 12155386320 in words is "twelve billion, one hundred fifty-five million, three hundred eighty-six thousand, three hundred twenty".