216615701 has 2 divisors, whose sum is σ = 216615702. Its totient is φ = 216615700.

The previous prime is 216615677. The next prime is 216615731. The reversal of 216615701 is 107516612.

216615701 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211731601 + 4884100 = 14551^2 + 2210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216615701 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 (216615731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108307850 + 108307851.

It is an arithmetic number, because the mean of its divisors is an integer number (108307851).

Almost surely, 2^216615701 is an apocalyptic number.

It is an amenable number.

216615701 is a deficient number, since it is larger than the sum of its proper divisors (1).

216615701 is an equidigital number, since it uses as much as digits as its factorization.

216615701 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 29.

The square root of 216615701 is about 14717.8701244440. The cubic root of 216615701 is about 600.5695526970.

The spelling of 216615701 in words is "two hundred sixteen million, six hundred fifteen thousand, seven hundred one".