25645864740 has 24 divisors (see below), whose sum is σ = 71808421440. Its totient is φ = 6838897248.

The previous prime is 25645864733. The next prime is 25645864747. The reversal of 25645864740 is 4746854652.

It is an interprime number because it is at equal distance from previous prime (25645864733) and next prime (25645864747).

It is a super-3 number, since 3×25645864740³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (25645864747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213715480 + ... + 213715599.

It is an arithmetic number, because the mean of its divisors is an integer number (2992017560).

Almost surely, 2^25645864740 is an apocalyptic number.

25645864740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25645864740 is an abundant number, since it is smaller than the sum of its proper divisors (46162556700).

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

25645864740 is a wasteful number, since it uses less digits than its factorization.

25645864740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427431091 (or 427431089 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 51.

The spelling of 25645864740 in words is "twenty-five billion, six hundred forty-five million, eight hundred sixty-four thousand, seven hundred forty".