66807066704539 has 4 divisors (see below), whose sum is σ = 76350933376624. Its totient is φ = 57263200032456.

The previous prime is 66807066704527. The next prime is 66807066704551. The reversal of 66807066704539 is 93540766070866.

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

It is an interprime number because it is at equal distance from previous prime (66807066704527) and next prime (66807066704551).

It is a cyclic number.

It is not a de Polignac number, because 66807066704539 - 2²³ = 66807058315931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66807066704839) 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, 4771933336032 + ... + 4771933336045.

It is an arithmetic number, because the mean of its divisors is an integer number (19087733344156).

Almost surely, 2^{66807066704539} is an apocalyptic number.

66807066704539 is a deficient number, since it is larger than the sum of its proper divisors (9543866672085).

66807066704539 is an equidigital number, since it uses as much as digits as its factorization.

66807066704539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9543866672084.

The product of its (nonzero) digits is 274337280, while the sum is 67.

The spelling of 66807066704539 in words is "sixty-six trillion, eight hundred seven billion, sixty-six million, seven hundred four thousand, five hundred thirty-nine".