25990951284 has 18 divisors (see below), whose sum is σ = 65699349170. Its totient is φ = 8663650416.

The previous prime is 25990951267. The next prime is 25990951297. The reversal of 25990951284 is 48215909952.

It can be written as a sum of positive squares in only one way, i.e., 17923318884 + 8067632400 = 133878^2 + 89820^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×25990951284² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 25990951284.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 360985399 + ... + 360985470.

Almost surely, 2^25990951284 is an apocalyptic number.

It is an amenable number.

25990951284 is an abundant number, since it is smaller than the sum of its proper divisors (39708397886).

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

25990951284 is a wasteful number, since it uses less digits than its factorization.

25990951284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721970879 (or 721970874 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 25990951284 in words is "twenty-five billion, nine hundred ninety million, nine hundred fifty-one thousand, two hundred eighty-four".