25510520020 has 12 divisors (see below), whose sum is σ = 53572092084. Its totient is φ = 10204208000.

The previous prime is 25510520017. The next prime is 25510520023. The reversal of 25510520020 is 2002501552.

It is an interprime number because it is at equal distance from previous prime (25510520017) and next prime (25510520023).

It can be written as a sum of positive squares in 2 ways, for example, as 19929533584 + 5580986436 = 141172^2 + 74706^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25510519973 and 25510520000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25510520023) 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 3 ways as a sum of consecutive naturals, for example, 637762981 + ... + 637763020.

It is an arithmetic number, because the mean of its divisors is an integer number (4464341007).

Almost surely, 2^25510520020 is an apocalyptic number.

25510520020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25510520020 is an abundant number, since it is smaller than the sum of its proper divisors (28061572064).

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

25510520020 is a wasteful number, since it uses less digits than its factorization.

25510520020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275526010 (or 1275526008 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The spelling of 25510520020 in words is "twenty-five billion, five hundred ten million, five hundred twenty thousand, twenty".