25206081340 has 144 divisors (see below), whose sum is σ = 63598348800. Its totient is φ = 8305292160.

The previous prime is 25206081337. The next prime is 25206081361. The reversal of 25206081340 is 4318060252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1819761 + ... + 1833559.

It is an arithmetic number, because the mean of its divisors is an integer number (441655200).

Almost surely, 2^25206081340 is an apocalyptic number.

25206081340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25206081340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31799174400).

25206081340 is an abundant number, since it is smaller than the sum of its proper divisors (38392267460).

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

25206081340 is a wasteful number, since it uses less digits than its factorization.

25206081340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13880 (or 13859 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 25206081340 in words is "twenty-five billion, two hundred six million, eighty-one thousand, three hundred forty".