25988978519 has 16 divisors (see below), whose sum is σ = 30224848896. Its totient is φ = 21887268000.

The previous prime is 25988978513. The next prime is 25988978527. The reversal of 25988978519 is 91587988952.

It is a cyclic number.

It is not a de Polignac number, because 25988978519 - 2⁴ = 25988978503 is a prime.

It is a super-2 number, since 2×25988978519² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25988978513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47687 + ... + 232920.

It is an arithmetic number, because the mean of its divisors is an integer number (1889053056).

Almost surely, 2^25988978519 is an apocalyptic number.

25988978519 is a deficient number, since it is larger than the sum of its proper divisors (4235870377).

25988978519 is a wasteful number, since it uses less digits than its factorization.

25988978519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280846.

The product of its digits is 130636800, while the sum is 71.

The spelling of 25988978519 in words is "twenty-five billion, nine hundred eighty-eight million, nine hundred seventy-eight thousand, five hundred nineteen".