12961425888 has 72 divisors (see below), whose sum is σ = 38461642128. Its totient is φ = 4132626432.

The previous prime is 12961425881. The next prime is 12961425907. The reversal of 12961425888 is 88852416921.

12961425888 is a `hidden beast` number, since 12 + 9 + 6 + 1 + 42 + 588 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×12961425888² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12961425881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 971745 + ... + 984992.

It is an arithmetic number, because the mean of its divisors is an integer number (534189474).

Almost surely, 2^12961425888 is an apocalyptic number.

12961425888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12961425888 is an abundant number, since it is smaller than the sum of its proper divisors (25500216240).

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

12961425888 is a wasteful number, since it uses less digits than its factorization.

12961425888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956776 (or 1956765 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The spelling of 12961425888 in words is "twelve billion, nine hundred sixty-one million, four hundred twenty-five thousand, eight hundred eighty-eight".