216516757 has 2 divisors, whose sum is σ = 216516758. Its totient is φ = 216516756.

The previous prime is 216516691. The next prime is 216516767. The reversal of 216516757 is 757615612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206238321 + 10278436 = 14361^2 + 3206^2 .

It is a cyclic number.

It is not a de Polignac number, because 216516757 - 2²⁷ = 82299029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216516767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108258378 + 108258379.

It is an arithmetic number, because the mean of its divisors is an integer number (108258379).

Almost surely, 2^216516757 is an apocalyptic number.

It is an amenable number.

216516757 is a deficient number, since it is larger than the sum of its proper divisors (1).

216516757 is an equidigital number, since it uses as much as digits as its factorization.

216516757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 40.

The square root of 216516757 is about 14714.5083845842. The cubic root of 216516757 is about 600.4780976403.

The spelling of 216516757 in words is "two hundred sixteen million, five hundred sixteen thousand, seven hundred fifty-seven".