66360138287 has 4 divisors (see below), whose sum is σ = 68153655576. Its totient is φ = 64566621000.

The previous prime is 66360138281. The next prime is 66360138323. The reversal of 66360138287 is 78283106366.

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 66360138287 - 2²⁶ = 66293029423 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 (66360138281) 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, 896758589 + ... + 896758662.

It is an arithmetic number, because the mean of its divisors is an integer number (17038413894).

Almost surely, 2^66360138287 is an apocalyptic number.

66360138287 is a deficient number, since it is larger than the sum of its proper divisors (1793517289).

66360138287 is a wasteful number, since it uses less digits than its factorization.

66360138287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793517288.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 66360138287 in words is "sixty-six billion, three hundred sixty million, one hundred thirty-eight thousand, two hundred eighty-seven".