25406662005 has 24 divisors (see below), whose sum is σ = 44104889400. Its totient is φ = 13529704320.

The previous prime is 25406661977. The next prime is 25406662007. The reversal of 25406662005 is 50026660452.

It can be written as a sum of positive squares in 4 ways, for example, as 212401476 + 25194260529 = 14574^2 + 158727^2 .

It is not a de Polignac number, because 25406662005 - 2⁶ = 25406661941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25406662007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397330 + ... + 456819.

It is an arithmetic number, because the mean of its divisors is an integer number (1837703725).

Almost surely, 2^25406662005 is an apocalyptic number.

It is an amenable number.

25406662005 is a deficient number, since it is larger than the sum of its proper divisors (18698227395).

25406662005 is a wasteful number, since it uses less digits than its factorization.

25406662005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854821 (or 854818 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 25406662005 in words is "twenty-five billion, four hundred six million, six hundred sixty-two thousand, five".