66536740319 has 32 divisors (see below), whose sum is σ = 83594695680. Its totient is φ = 51637208832.

The previous prime is 66536740267. The next prime is 66536740349. The reversal of 66536740319 is 91304763566.

It is a cyclic number.

It is not a de Polignac number, because 66536740319 - 2²⁸ = 66268304863 is a prime.

It is a super-2 number, since 2×66536740319² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66536740349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3897827 + ... + 3914859.

It is an arithmetic number, because the mean of its divisors is an integer number (2612334240).

Almost surely, 2^66536740319 is an apocalyptic number.

66536740319 is a deficient number, since it is larger than the sum of its proper divisors (17057955361).

66536740319 is a wasteful number, since it uses less digits than its factorization.

66536740319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18359.

The product of its (nonzero) digits is 2449440, while the sum is 50.

The spelling of 66536740319 in words is "sixty-six billion, five hundred thirty-six million, seven hundred forty thousand, three hundred nineteen".