25540452757806 has 64 divisors (see below), whose sum is σ = 61488813657600. Its totient is φ = 6908918979456.

The previous prime is 25540452757777. The next prime is 25540452757817. The reversal of 25540452757806 is 60875725404552.

It is a happy number.

It is a super-2 number, since 2×25540452757806² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25540452757806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8633961 + ... + 11208308.

It is an arithmetic number, because the mean of its divisors is an integer number (960762713400).

Almost surely, 2^{25540452757806} is an apocalyptic number.

25540452757806 is an abundant number, since it is smaller than the sum of its proper divisors (35948360899794).

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

25540452757806 is a wasteful number, since it uses less digits than its factorization.

25540452757806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19843913.

The product of its (nonzero) digits is 94080000, while the sum is 60.

The spelling of 25540452757806 in words is "twenty-five trillion, five hundred forty billion, four hundred fifty-two million, seven hundred fifty-seven thousand, eight hundred six".