72665637227 has 4 divisors (see below), whose sum is σ = 74036687040. Its totient is φ = 71294587416.

The previous prime is 72665637223. The next prime is 72665637269. The reversal of 72665637227 is 72273656627.

It is a happy number.

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 72665637227 - 2² = 72665637223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1371049759 = 72665637227 / (7 + 2 + 6 + 6 + 5 + 6 + 3 + 7 + 2 + 2 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72665637223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685524827 + ... + 685524932.

It is an arithmetic number, because the mean of its divisors is an integer number (18509171760).

Almost surely, 2^72665637227 is an apocalyptic number.

72665637227 is a deficient number, since it is larger than the sum of its proper divisors (1371049813).

72665637227 is a wasteful number, since it uses less digits than its factorization.

72665637227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371049812.

The product of its digits is 8890560, while the sum is 53.

The spelling of 72665637227 in words is "seventy-two billion, six hundred sixty-five million, six hundred thirty-seven thousand, two hundred twenty-seven".