72610661 has 2 divisors, whose sum is σ = 72610662. Its totient is φ = 72610660.

The previous prime is 72610639. The next prime is 72610669. The reversal of 72610661 is 16601627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62568100 + 10042561 = 7910^2 + 3169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72610661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72610669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36305330 + 36305331.

It is an arithmetic number, because the mean of its divisors is an integer number (36305331).

Almost surely, 2^72610661 is an apocalyptic number.

It is an amenable number.

72610661 is a deficient number, since it is larger than the sum of its proper divisors (1).

72610661 is an equidigital number, since it uses as much as digits as its factorization.

72610661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 72610661 is about 8521.1889428647. The cubic root of 72610661 is about 417.1895903452.

The spelling of 72610661 in words is "seventy-two million, six hundred ten thousand, six hundred sixty-one".