25445136340 has 48 divisors (see below), whose sum is σ = 57627657360. Its totient is φ = 9381657600.

The previous prime is 25445136329. The next prime is 25445136383. The reversal of 25445136340 is 4363154452.

It can be written as a sum of positive squares in 8 ways, for example, as 1383542416 + 24061593924 = 37196^2 + 155118^2 .

It is a super-2 number, since 2×25445136340² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25445136340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112456 + ... + 252064.

It is an arithmetic number, because the mean of its divisors is an integer number (1200576195).

Almost surely, 2^25445136340 is an apocalyptic number.

25445136340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25445136340 is an abundant number, since it is smaller than the sum of its proper divisors (32182521020).

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

25445136340 is a wasteful number, since it uses less digits than its factorization.

25445136340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140332 (or 140330 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 25445136340 in words is "twenty-five billion, four hundred forty-five million, one hundred thirty-six thousand, three hundred forty".