72650161 has 2 divisors, whose sum is σ = 72650162. Its totient is φ = 72650160.

The previous prime is 72650159. The next prime is 72650183. The reversal of 72650161 is 16105627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 6471936 = 8135^2 + 2544^2 .

It is a cyclic number.

It is not a de Polignac number, because 72650161 - 2¹ = 72650159 is a prime.

Together with 72650159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (75650161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36325080 + 36325081.

It is an arithmetic number, because the mean of its divisors is an integer number (36325081).

Almost surely, 2^72650161 is an apocalyptic number.

It is an amenable number.

72650161 is a deficient number, since it is larger than the sum of its proper divisors (1).

72650161 is an equidigital number, since it uses as much as digits as its factorization.

72650161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 72650161 is about 8523.5063794192. The cubic root of 72650161 is about 417.2652266284.

Adding to 72650161 its reverse (16105627), we get a palindrome (88755788).

The spelling of 72650161 in words is "seventy-two million, six hundred fifty thousand, one hundred sixty-one".