25121036512 has 72 divisors (see below), whose sum is σ = 58543670808. Its totient is φ = 10540273920.

The previous prime is 25121036509. The next prime is 25121036539. The reversal of 25121036512 is 21563012152.

It is a super-2 number, since 2×25121036512² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199198 + ... + 299869.

It is an arithmetic number, because the mean of its divisors is an integer number (813106539).

Almost surely, 2^25121036512 is an apocalyptic number.

25121036512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

25121036512 is an abundant number, since it is smaller than the sum of its proper divisors (33422634296).

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

25121036512 is a wasteful number, since it uses less digits than its factorization.

25121036512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499112 (or 499093 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 25121036512 its reverse (21563012152), we get a palindrome (46684048664).

The spelling of 25121036512 in words is "twenty-five billion, one hundred twenty-one million, thirty-six thousand, five hundred twelve".