25643502620 has 12 divisors (see below), whose sum is σ = 53851355544. Its totient is φ = 10257401040.

The previous prime is 25643502617. The next prime is 25643502623. The reversal of 25643502620 is 2620534652.

It is an interprime number because it is at equal distance from previous prime (25643502617) and next prime (25643502623).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643502623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641087546 + ... + 641087585.

It is an arithmetic number, because the mean of its divisors is an integer number (4487612962).

Almost surely, 2^25643502620 is an apocalyptic number.

25643502620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25643502620 is an abundant number, since it is smaller than the sum of its proper divisors (28207852924).

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

25643502620 is a wasteful number, since it uses less digits than its factorization.

25643502620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282175140 (or 1282175138 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 25643502620 in words is "twenty-five billion, six hundred forty-three million, five hundred two thousand, six hundred twenty".