7216390161 has 12 divisors (see below), whose sum is σ = 10666086288. Its totient is φ = 4699044504.

The previous prime is 7216390157. The next prime is 7216390183. The reversal of 7216390161 is 1610936127.

7216390161 is a `hidden beast` number, since 7 + 2 + 1 + 639 + 0 + 16 + 1 = 666.

It is not a de Polignac number, because 7216390161 - 2² = 7216390157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7216390121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9323115 + ... + 9323888.

It is an arithmetic number, because the mean of its divisors is an integer number (888840524).

Almost surely, 2^7216390161 is an apocalyptic number.

It is an amenable number.

7216390161 is a deficient number, since it is larger than the sum of its proper divisors (3449696127).

7216390161 is a wasteful number, since it uses less digits than its factorization.

7216390161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18647052 (or 18647049 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 7216390161 is about 84949.3387908346. The cubic root of 7216390161 is about 1932.4428927215.

The spelling of 7216390161 in words is "seven billion, two hundred sixteen million, three hundred ninety thousand, one hundred sixty-one".