25609862020 has 12 divisors (see below), whose sum is σ = 53780710284. Its totient is φ = 10243944800.

The previous prime is 25609862009. The next prime is 25609862071. The reversal of 25609862020 is 2026890652.

It can be written as a sum of positive squares in 2 ways, for example, as 19995656836 + 5614205184 = 141406^2 + 74928^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640246531 + ... + 640246570.

It is an arithmetic number, because the mean of its divisors is an integer number (4481725857).

Almost surely, 2^25609862020 is an apocalyptic number.

25609862020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25609862020 is an abundant number, since it is smaller than the sum of its proper divisors (28170848264).

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

25609862020 is a wasteful number, since it uses less digits than its factorization.

25609862020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280493110 (or 1280493108 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 25609862020 in words is "twenty-five billion, six hundred nine million, eight hundred sixty-two thousand, twenty".