25515493668 has 192 divisors, whose sum is σ = 77491814400. Its totient is φ = 7109009280.

The previous prime is 25515493667. The next prime is 25515493711. The reversal of 25515493668 is 86639451552.

25515493668 is a `hidden beast` number, since 2 + 5 + 5 + 1 + 549 + 36 + 68 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (25515493667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11049298 + ... + 11051606.

It is an arithmetic number, because the mean of its divisors is an integer number (403603200).

Almost surely, 2^25515493668 is an apocalyptic number.

25515493668 is a gapful number since it is divisible by the number (28) 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 25515493668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38745907200).

25515493668 is an abundant number, since it is smaller than the sum of its proper divisors (51976320732).

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

25515493668 is a wasteful number, since it uses less digits than its factorization.

25515493668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687 (or 2679 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The spelling of 25515493668 in words is "twenty-five billion, five hundred fifteen million, four hundred ninety-three thousand, six hundred sixty-eight".