66453128309 has 24 divisors (see below), whose sum is σ = 69286072128. Its totient is φ = 63722615040.

The previous prime is 66453128303. The next prime is 66453128341. The reversal of 66453128309 is 90382135466.

It is a de Polignac number, because none of the positive numbers 2^k-66453128309 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66453128303) 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, 22068614 + ... + 22071624.

It is an arithmetic number, because the mean of its divisors is an integer number (2886919672).

Almost surely, 2^66453128309 is an apocalyptic number.

It is an amenable number.

66453128309 is a deficient number, since it is larger than the sum of its proper divisors (2832943819).

66453128309 is a wasteful number, since it uses less digits than its factorization.

66453128309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305 (or 3258 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 66453128309 in words is "sixty-six billion, four hundred fifty-three million, one hundred twenty-eight thousand, three hundred nine".