66139361363 has 4 divisors (see below), whose sum is σ = 66140353368. Its totient is φ = 66138369360.

The previous prime is 66139361341. The next prime is 66139361383. The reversal of 66139361363 is 36316393166.

It is a happy number.

66139361363 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66139361363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66139361303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388181 + ... + 531942.

It is an arithmetic number, because the mean of its divisors is an integer number (16535088342).

Almost surely, 2^66139361363 is an apocalyptic number.

66139361363 is a deficient number, since it is larger than the sum of its proper divisors (992005).

66139361363 is an equidigital number, since it uses as much as digits as its factorization.

66139361363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992004.

The product of its digits is 944784, while the sum is 47.

The spelling of 66139361363 in words is "sixty-six billion, one hundred thirty-nine million, three hundred sixty-one thousand, three hundred sixty-three".