12651115554 has 288 divisors, whose sum is σ = 36292733568. Its totient is φ = 3113510400.

The previous prime is 12651115549. The next prime is 12651115559. The reversal of 12651115554 is 45551115621.

12651115554 is a `hidden beast` number, since 126 + 511 + 15 + 5 + 5 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (12651115549) and next prime (12651115559).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12651115559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 23127909 + ... + 23128455.

It is an arithmetic number, because the mean of its divisors is an integer number (126016436).

Almost surely, 2^12651115554 is an apocalyptic number.

12651115554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12651115554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18146366784).

12651115554 is an abundant number, since it is smaller than the sum of its proper divisors (23641618014).

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

12651115554 is a wasteful number, since it uses less digits than its factorization.

12651115554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 648 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The spelling of 12651115554 in words is "twelve billion, six hundred fifty-one million, one hundred fifteen thousand, five hundred fifty-four".