66245383636 has 6 divisors (see below), whose sum is σ = 115929421370. Its totient is φ = 33122691816.

The previous prime is 66245383621. The next prime is 66245383639. The reversal of 66245383636 is 63638354266.

It is a happy number.

66245383636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 64233861136 + 2011522500 = 253444^2 + 44850^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66245383639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8280672951 + ... + 8280672958.

Almost surely, 2^66245383636 is an apocalyptic number.

It is an amenable number.

66245383636 is a deficient number, since it is larger than the sum of its proper divisors (49684037734).

66245383636 is a wasteful number, since it uses less digits than its factorization.

66245383636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16561345913 (or 16561345911 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 52.

The spelling of 66245383636 in words is "sixty-six billion, two hundred forty-five million, three hundred eighty-three thousand, six hundred thirty-six".