25999427520 has 448 divisors, whose sum is σ = 101494010880. Its totient is φ = 6212505600.

The previous prime is 25999427471. The next prime is 25999427527. The reversal of 25999427520 is 2572499952.

25999427520 is a `hidden beast` number, since 2 + 5 + 9 + 9 + 94 + 27 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25999427527) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6745914 + ... + 6749766.

Almost surely, 2^25999427520 is an apocalyptic number.

25999427520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25999427520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50747005440).

25999427520 is an abundant number, since it is smaller than the sum of its proper divisors (75494583360).

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

25999427520 is a wasteful number, since it uses less digits than its factorization.

25999427520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961 (or 3945 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 25999427520 in words is "twenty-five billion, nine hundred ninety-nine million, four hundred twenty-seven thousand, five hundred twenty".