66539019007 has 4 divisors (see below), whose sum is σ = 66561832696. Its totient is φ = 66516205320.

The previous prime is 66539018993. The next prime is 66539019059. The reversal of 66539019007 is 70091093566.

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

It is a cyclic number.

It is not a de Polignac number, because 66539019007 - 2²³ = 66530630399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66539019077) 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, 11402469 + ... + 11408302.

It is an arithmetic number, because the mean of its divisors is an integer number (16640458174).

Almost surely, 2^66539019007 is an apocalyptic number.

66539019007 is a deficient number, since it is larger than the sum of its proper divisors (22813689).

66539019007 is a wasteful number, since it uses less digits than its factorization.

66539019007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22813688.

The product of its (nonzero) digits is 306180, while the sum is 46.

The spelling of 66539019007 in words is "sixty-six billion, five hundred thirty-nine million, nineteen thousand, seven".