25247097666 has 96 divisors (see below), whose sum is σ = 65872310400. Its totient is φ = 6827016960.

The previous prime is 25247097661. The next prime is 25247097671. The reversal of 25247097666 is 66679074252.

It is an interprime number because it is at equal distance from previous prime (25247097661) and next prime (25247097671).

It is not an unprimeable number, because it can be changed into a prime (25247097661) 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, 2698156 + ... + 2707496.

It is an arithmetic number, because the mean of its divisors is an integer number (686169900).

Almost surely, 2^25247097666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25247097666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32936155200).

25247097666 is an abundant number, since it is smaller than the sum of its proper divisors (40625212734).

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

25247097666 is a wasteful number, since it uses less digits than its factorization.

25247097666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10504 (or 10501 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

It can be divided in two parts, 2524709 and 7666, that added together give a triangular number (2532375 = T₂₂₅₀).

The spelling of 25247097666 in words is "twenty-five billion, two hundred forty-seven million, ninety-seven thousand, six hundred sixty-six".