72066139 has 2 divisors, whose sum is σ = 72066140. Its totient is φ = 72066138.

The previous prime is 72066133. The next prime is 72066143. The reversal of 72066139 is 93166027.

It is a strong prime.

It is an emirp because it is prime and its reverse (93166027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72066139 is a prime.

It is not a weakly prime, because it can be changed into another prime (72066133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36033069 + 36033070.

It is an arithmetic number, because the mean of its divisors is an integer number (36033070).

Almost surely, 2^72066139 is an apocalyptic number.

72066139 is a deficient number, since it is larger than the sum of its proper divisors (1).

72066139 is an equidigital number, since it uses as much as digits as its factorization.

72066139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 72066139 is about 8489.1777575923. The cubic root of 72066139 is about 416.1441095736.

The spelling of 72066139 in words is "seventy-two million, sixty-six thousand, one hundred thirty-nine".