25851901680 has 300 divisors, whose sum is σ = 98695021656. Its totient is φ = 6266937600.

The previous prime is 25851901643. The next prime is 25851901727. The reversal of 25851901680 is 8610915852.

It is a happy number.

25851901680 is a `hidden beast` number, since 2 + 58 + 519 + 0 + 1 + 6 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 767595 + ... + 800565.

Almost surely, 2^25851901680 is an apocalyptic number.

25851901680 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 25851901680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49347510828).

25851901680 is an abundant number, since it is smaller than the sum of its proper divisors (72843119976).

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

25851901680 is a wasteful number, since it uses less digits than its factorization.

25851901680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33018 (or 32992 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 25851901680 in words is "twenty-five billion, eight hundred fifty-one million, nine hundred one thousand, six hundred eighty".