25556215412 has 24 divisors (see below), whose sum is σ = 55044157056. Its totient is φ = 10110151008.

The previous prime is 25556215409. The next prime is 25556215427. The reversal of 25556215412 is 21451265552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35104328 + ... + 35105055.

It is an arithmetic number, because the mean of its divisors is an integer number (2293506544).

Almost surely, 2^25556215412 is an apocalyptic number.

It is an amenable number.

25556215412 is an abundant number, since it is smaller than the sum of its proper divisors (29487941644).

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

25556215412 is a wasteful number, since it uses less digits than its factorization.

25556215412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70209407 (or 70209405 counting only the distinct ones).

The product of its digits is 120000, while the sum is 38.

The spelling of 25556215412 in words is "twenty-five billion, five hundred fifty-six million, two hundred fifteen thousand, four hundred twelve".