72741661 has 2 divisors, whose sum is σ = 72741662. Its totient is φ = 72741660.

The previous prime is 72741637. The next prime is 72741677. The reversal of 72741661 is 16614727.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 2013561 = 8410^2 + 1419^2 .

It is a cyclic number.

It is not a de Polignac number, because 72741661 - 2⁷ = 72741533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72741601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36370830 + 36370831.

It is an arithmetic number, because the mean of its divisors is an integer number (36370831).

Almost surely, 2^72741661 is an apocalyptic number.

It is an amenable number.

72741661 is a deficient number, since it is larger than the sum of its proper divisors (1).

72741661 is an equidigital number, since it uses as much as digits as its factorization.

72741661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 72741661 is about 8528.8721997694. The cubic root of 72741661 is about 417.4403294787.

The spelling of 72741661 in words is "seventy-two million, seven hundred forty-one thousand, six hundred sixty-one".