25642411640 has 32 divisors (see below), whose sum is σ = 57747833280. Its totient is φ = 10247647872.

The previous prime is 25642411637. The next prime is 25642411643. The reversal of 25642411640 is 4611424652.

It is an interprime number because it is at equal distance from previous prime (25642411637) and next prime (25642411643).

It is a self number, because there is not a number n which added to its sum of digits gives 25642411640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25642411643) 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 7 ways as a sum of consecutive naturals, for example, 246479 + ... + 334718.

It is an arithmetic number, because the mean of its divisors is an integer number (1804619790).

Almost surely, 2^25642411640 is an apocalyptic number.

25642411640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25642411640 is an abundant number, since it is smaller than the sum of its proper divisors (32105421640).

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

25642411640 is a wasteful number, since it uses less digits than its factorization.

25642411640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582311 (or 582307 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 25642411640 in words is "twenty-five billion, six hundred forty-two million, four hundred eleven thousand, six hundred forty".