25156034640 has 240 divisors, whose sum is σ = 92754170496. Its totient is φ = 6059289600.

The previous prime is 25156034621. The next prime is 25156034641. The reversal of 25156034640 is 4643065152.

25156034640 is a `hidden beast` number, since 2 + 5 + 1 + 5 + 6 + 0 + 3 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25156034595 and 25156034604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25156034641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1233325 + ... + 1253555.

Almost surely, 2^25156034640 is an apocalyptic number.

25156034640 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 25156034640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46377085248).

25156034640 is an abundant number, since it is smaller than the sum of its proper divisors (67598135856).

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

25156034640 is a wasteful number, since it uses less digits than its factorization.

25156034640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20418 (or 20409 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 25156034640 its reverse (4643065152), we get a palindrome (29799099792).

The spelling of 25156034640 in words is "twenty-five billion, one hundred fifty-six million, thirty-four thousand, six hundred forty".