25721048916 has 36 divisors (see below), whose sum is σ = 65057352724. Its totient is φ = 8568374400.

The previous prime is 25721048911. The next prime is 25721048917. The reversal of 25721048916 is 61984012752.

It can be written as a sum of positive squares in 2 ways, for example, as 17016158916 + 8704890000 = 130446^2 + 93300^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×25721048916³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25721048911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162025 + ... + 278736.

Almost surely, 2^25721048916 is an apocalyptic number.

It is an amenable number.

25721048916 is an abundant number, since it is smaller than the sum of its proper divisors (39336303808).

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

25721048916 is a wasteful number, since it uses less digits than its factorization.

25721048916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442392 (or 442387 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 25721048916 in words is "twenty-five billion, seven hundred twenty-one million, forty-eight thousand, nine hundred sixteen".