25400540566 has 8 divisors (see below), whose sum is σ = 38101670784. Its totient is φ = 12699983640.

The previous prime is 25400540563. The next prime is 25400540591. The reversal of 25400540566 is 66504500452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×25400540566² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400540563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6390 + ... + 225481.

It is an arithmetic number, because the mean of its divisors is an integer number (4762708848).

Almost surely, 2^25400540566 is an apocalyptic number.

25400540566 is a deficient number, since it is larger than the sum of its proper divisors (12701130218).

25400540566 is a wasteful number, since it uses less digits than its factorization.

25400540566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286646.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 25400540566 in words is "twenty-five billion, four hundred million, five hundred forty thousand, five hundred sixty-six".