66226667525 has 48 divisors (see below), whose sum is σ = 87470182800. Its totient is φ = 49568563200.

The previous prime is 66226667509. The next prime is 66226667527. The reversal of 66226667525 is 52576662266.

It is a happy number.

It can be written as a sum of positive squares in 24 ways, for example, as 15914831716 + 50311835809 = 126154^2 + 224303^2 .

It is not a de Polignac number, because 66226667525 - 2⁴ = 66226667509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66226667527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77276897 + ... + 77277753.

It is an arithmetic number, because the mean of its divisors is an integer number (1822295475).

Almost surely, 2^66226667525 is an apocalyptic number.

It is an amenable number.

66226667525 is a deficient number, since it is larger than the sum of its proper divisors (21243515275).

66226667525 is a wasteful number, since it uses less digits than its factorization.

66226667525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754 (or 1749 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 53.

The spelling of 66226667525 in words is "sixty-six billion, two hundred twenty-six million, six hundred sixty-seven thousand, five hundred twenty-five".