25942616820 has 84 divisors (see below), whose sum is σ = 81681922980. Its totient is φ = 6918027264.

The previous prime is 25942616813. The next prime is 25942616827. The reversal of 25942616820 is 2861624952.

25942616820 is a `hidden beast` number, since 2 + 5 + 9 + 4 + 2 + 616 + 8 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (25942616813) and next prime (25942616827).

It can be written as a sum of positive squares in 2 ways, for example, as 12350321424 + 13592295396 = 111132^2 + 116586^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25942616827) 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 27 ways as a sum of consecutive naturals, for example, 875085 + ... + 904244.

It is an arithmetic number, because the mean of its divisors is an integer number (972403845).

Almost surely, 2^25942616820 is an apocalyptic number.

25942616820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25942616820 is an abundant number, since it is smaller than the sum of its proper divisors (55739306160).

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

25942616820 is a wasteful number, since it uses less digits than its factorization.

25942616820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779356 (or 1779339 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 25942616820 in words is "twenty-five billion, nine hundred forty-two million, six hundred sixteen thousand, eight hundred twenty".