72016722161 has 2 divisors, whose sum is σ = 72016722162. Its totient is φ = 72016722160.

The previous prime is 72016722149. The next prime is 72016722247. The reversal of 72016722161 is 16122761027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50431235761 + 21585486400 = 224569^2 + 146920^2 .

It is a cyclic number.

It is not a de Polignac number, because 72016722161 - 2¹⁴ = 72016705777 is a prime.

It is not a weakly prime, because it can be changed into another prime (72016722121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36008361080 + 36008361081.

It is an arithmetic number, because the mean of its divisors is an integer number (36008361081).

Almost surely, 2^72016722161 is an apocalyptic number.

It is an amenable number.

72016722161 is a deficient number, since it is larger than the sum of its proper divisors (1).

72016722161 is an equidigital number, since it uses as much as digits as its factorization.

72016722161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 72016722161 in words is "seventy-two billion, sixteen million, seven hundred twenty-two thousand, one hundred sixty-one".