25212565656516 has 48 divisors (see below), whose sum is σ = 68502065192064. Its totient is φ = 7067673390336.

The previous prime is 25212565656511. The next prime is 25212565656563. The reversal of 25212565656516 is 61565656521252.

It is not an unprimeable number, because it can be changed into a prime (25212565656511) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2831595465 + ... + 2831604368.

It is an arithmetic number, because the mean of its divisors is an integer number (1427126358168).

Almost surely, 2^{25212565656516} is an apocalyptic number.

It is an amenable number.

25212565656516 is an abundant number, since it is smaller than the sum of its proper divisors (43289499535548).

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

25212565656516 is a wasteful number, since it uses less digits than its factorization.

25212565656516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663199900 (or 5663199898 counting only the distinct ones).

The product of its digits is 32400000, while the sum is 57.

The spelling of 25212565656516 in words is "twenty-five trillion, two hundred twelve billion, five hundred sixty-five million, six hundred fifty-six thousand, five hundred sixteen".