25263391716 has 54 divisors (see below), whose sum is σ = 64828018710. Its totient is φ = 8295388992.

The previous prime is 25263391663. The next prime is 25263391717. The reversal of 25263391716 is 61719336252.

25263391716 is a `hidden beast` number, since 2 + 5 + 2 + 633 + 9 + 1 + 7 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21529692900 + 3733698816 = 146730^2 + 61104^2 .

It is not an unprimeable number, because it can be changed into a prime (25263391717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 83440 + ... + 239768.

It is an arithmetic number, because the mean of its divisors is an integer number (1200518865).

Almost surely, 2^25263391716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25263391716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32414009355).

25263391716 is an abundant number, since it is smaller than the sum of its proper divisors (39564626994).

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

25263391716 is a wasteful number, since it uses less digits than its factorization.

25263391716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156473 (or 156401 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The spelling of 25263391716 in words is "twenty-five billion, two hundred sixty-three million, three hundred ninety-one thousand, seven hundred sixteen".