25420160640 has 128 divisors (see below), whose sum is σ = 92602062720. Its totient is φ = 5810319360.

The previous prime is 25420160617. The next prime is 25420160651. The reversal of 25420160640 is 4606102452.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25420160598 and 25420160607.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 932251 + ... + 959130.

It is an arithmetic number, because the mean of its divisors is an integer number (723453615).

Almost surely, 2^25420160640 is an apocalyptic number.

25420160640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25420160640 is an abundant number, since it is smaller than the sum of its proper divisors (67181902080).

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

25420160640 is a wasteful number, since it uses less digits than its factorization.

25420160640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891410 (or 1891398 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 25420160640 in words is "twenty-five billion, four hundred twenty million, one hundred sixty thousand, six hundred forty".