66372735215 has 4 divisors (see below), whose sum is σ = 79647282264. Its totient is φ = 53098188168.

The previous prime is 66372735211. The next prime is 66372735229. The reversal of 66372735215 is 51253727366.

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 66372735215 - 2² = 66372735211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66372735215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66372735211) 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, 6637273517 + ... + 6637273526.

It is an arithmetic number, because the mean of its divisors is an integer number (19911820566).

Almost surely, 2^66372735215 is an apocalyptic number.

66372735215 is a deficient number, since it is larger than the sum of its proper divisors (13274547049).

66372735215 is a wasteful number, since it uses less digits than its factorization.

66372735215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13274547048.

The product of its digits is 1587600, while the sum is 47.

The spelling of 66372735215 in words is "sixty-six billion, three hundred seventy-two million, seven hundred thirty-five thousand, two hundred fifteen".