25646441340 has 48 divisors (see below), whose sum is σ = 77333887008. Its totient is φ = 6312969984.

The previous prime is 25646441339. The next prime is 25646441347. The reversal of 25646441340 is 4314464652.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25646441347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16439247 + ... + 16440806.

It is an arithmetic number, because the mean of its divisors is an integer number (1611122646).

Almost surely, 2^25646441340 is an apocalyptic number.

25646441340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25646441340 is an abundant number, since it is smaller than the sum of its proper divisors (51687445668).

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

25646441340 is a wasteful number, since it uses less digits than its factorization.

25646441340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32880078 (or 32880076 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 25646441340 in words is "twenty-five billion, six hundred forty-six million, four hundred forty-one thousand, three hundred forty".