25398549620 has 24 divisors (see below), whose sum is σ = 54637857288. Its totient is φ = 9911628800.

The previous prime is 25398549607. The next prime is 25398549667. The reversal of 25398549620 is 2694589352.

It can be written as a sum of positive squares in 4 ways, for example, as 1091245156 + 24307304464 = 33034^2 + 155908^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15486101 + ... + 15487740.

It is an arithmetic number, because the mean of its divisors is an integer number (2276577387).

Almost surely, 2^25398549620 is an apocalyptic number.

25398549620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25398549620 is an abundant number, since it is smaller than the sum of its proper divisors (29239307668).

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

25398549620 is a wasteful number, since it uses less digits than its factorization.

25398549620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30973891 (or 30973889 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 53.

The spelling of 25398549620 in words is "twenty-five billion, three hundred ninety-eight million, five hundred forty-nine thousand, six hundred twenty".