25640451524436 has 96 divisors (see below), whose sum is σ = 68539982730240. Its totient is φ = 7308131226624.

The previous prime is 25640451524431. The next prime is 25640451524449. The reversal of 25640451524436 is 63442515404652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640451524431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87146020 + ... + 87439748.

It is an arithmetic number, because the mean of its divisors is an integer number (713958153440).

Almost surely, 2^{25640451524436} is an apocalyptic number.

It is an amenable number.

25640451524436 is an abundant number, since it is smaller than the sum of its proper divisors (42899531205804).

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

25640451524436 is a wasteful number, since it uses less digits than its factorization.

25640451524436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296253 (or 296251 counting only the distinct ones).

The product of its (nonzero) digits is 13824000, while the sum is 51.

The spelling of 25640451524436 in words is "twenty-five trillion, six hundred forty billion, four hundred fifty-one million, five hundred twenty-four thousand, four hundred thirty-six".