72665251 has 2 divisors, whose sum is σ = 72665252. Its totient is φ = 72665250.

The previous prime is 72665137. The next prime is 72665261. The reversal of 72665251 is 15256627.

It is a strong prime.

It is an emirp because it is prime and its reverse (15256627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72665251 - 2¹⁷ = 72534179 is a prime.

It is not a weakly prime, because it can be changed into another prime (72665261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36332625 + 36332626.

It is an arithmetic number, because the mean of its divisors is an integer number (36332626).

Almost surely, 2^72665251 is an apocalyptic number.

72665251 is a deficient number, since it is larger than the sum of its proper divisors (1).

72665251 is an equidigital number, since it uses as much as digits as its factorization.

72665251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 72665251 is about 8524.3915325377. The cubic root of 72665251 is about 417.2941143660.

The spelling of 72665251 in words is "seventy-two million, six hundred sixty-five thousand, two hundred fifty-one".