25420641624 has 96 divisors (see below), whose sum is σ = 82103973120. Its totient is φ = 6947252928.

The previous prime is 25420641619. The next prime is 25420641629. The reversal of 25420641624 is 42614602452.

25420641624 is a `hidden beast` number, since 2 + 5 + 4 + 2 + 0 + 641 + 6 + 2 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (25420641619) and next prime (25420641629).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25420641629) 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 23 ways as a sum of consecutive naturals, for example, 1084882 + ... + 1108065.

It is an arithmetic number, because the mean of its divisors is an integer number (855249720).

Almost surely, 2^25420641624 is an apocalyptic number.

25420641624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25420641624 is an abundant number, since it is smaller than the sum of its proper divisors (56683331496).

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

25420641624 is a wasteful number, since it uses less digits than its factorization.

25420641624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192989 (or 2192982 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 25420641624 in words is "twenty-five billion, four hundred twenty million, six hundred forty-one thousand, six hundred twenty-four".