25950950640 has 320 divisors, whose sum is σ = 94426337280. Its totient is φ = 6540549120.

The previous prime is 25950950629. The next prime is 25950950699. The reversal of 25950950640 is 4605905952.

It is a happy number.

25950950640 is a `hidden beast` number, since 2 + 59 + 50 + 9 + 506 + 40 = 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 63 ways as a sum of consecutive naturals, for example, 2874774 + ... + 2883786.

It is an arithmetic number, because the mean of its divisors is an integer number (295082304).

Almost surely, 2^25950950640 is an apocalyptic number.

25950950640 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 25950950640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47213168640).

25950950640 is an abundant number, since it is smaller than the sum of its proper divisors (68475386640).

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

25950950640 is a wasteful number, since it uses less digits than its factorization.

25950950640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9109 (or 9097 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 25950950640 in words is "twenty-five billion, nine hundred fifty million, nine hundred fifty thousand, six hundred forty".