225666513651 has 64 divisors (see below), whose sum is σ = 354989606400. Its totient is φ = 126504032256.

The previous prime is 225666513649. The next prime is 225666513661. The reversal of 225666513651 is 156315666522.

It is not a de Polignac number, because 225666513651 - 2¹ = 225666513649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225666513651.

It is not an unprimeable number, because it can be changed into a prime (225666513641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1114965 + ... + 1301721.

It is an arithmetic number, because the mean of its divisors is an integer number (5546712600).

Almost surely, 2^225666513651 is an apocalyptic number.

225666513651 is a deficient number, since it is larger than the sum of its proper divisors (129323092749).

225666513651 is a wasteful number, since it uses less digits than its factorization.

225666513651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186868.

The product of its digits is 1944000, while the sum is 48.

The spelling of 225666513651 in words is "two hundred twenty-five billion, six hundred sixty-six million, five hundred thirteen thousand, six hundred fifty-one".