72165679 has 2 divisors, whose sum is σ = 72165680. Its totient is φ = 72165678.

The previous prime is 72165671. The next prime is 72165689. The reversal of 72165679 is 97656127.

It is a weak prime.

It is an emirp because it is prime and its reverse (97656127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72165679 - 2³ = 72165671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72165671) 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, 36082839 + 36082840.

It is an arithmetic number, because the mean of its divisors is an integer number (36082840).

Almost surely, 2^72165679 is an apocalyptic number.

72165679 is a deficient number, since it is larger than the sum of its proper divisors (1).

72165679 is an equidigital number, since it uses as much as digits as its factorization.

72165679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 43.

The square root of 72165679 is about 8495.0384931441. The cubic root of 72165679 is about 416.3356185045.

The spelling of 72165679 in words is "seventy-two million, one hundred sixty-five thousand, six hundred seventy-nine".