866516501 has 2 divisors, whose sum is σ = 866516502. Its totient is φ = 866516500.

The previous prime is 866516479. The next prime is 866516531. The reversal of 866516501 is 105615668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749335876 + 117180625 = 27374^2 + 10825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866516501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866516531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433258250 + 433258251.

It is an arithmetic number, because the mean of its divisors is an integer number (433258251).

Almost surely, 2^866516501 is an apocalyptic number.

It is an amenable number.

866516501 is a deficient number, since it is larger than the sum of its proper divisors (1).

866516501 is an equidigital number, since it uses as much as digits as its factorization.

866516501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 866516501 is about 29436.6523402373. The cubic root of 866516501 is about 953.3644330925.

The spelling of 866516501 in words is "eight hundred sixty-six million, five hundred sixteen thousand, five hundred one".