25503663520066 has 4 divisors (see below), whose sum is σ = 38255495280102. Its totient is φ = 12751831760032.

The previous prime is 25503663520063. The next prime is 25503663520067. The reversal of 25503663520066 is 66002536630552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13841636589225 + 11662026930841 = 3720435^2 + 3414971^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (25503663520063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6375915880015 + ... + 6375915880018.

Almost surely, 2^{25503663520066} is an apocalyptic number.

25503663520066 is a deficient number, since it is larger than the sum of its proper divisors (12751831760036).

25503663520066 is a wasteful number, since it uses less digits than its factorization.

25503663520066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12751831760035.

The product of its (nonzero) digits is 5832000, while the sum is 49.

The spelling of 25503663520066 in words is "twenty-five trillion, five hundred three billion, six hundred sixty-three million, five hundred twenty thousand, sixty-six".