65660899 has 2 divisors, whose sum is σ = 65660900. Its totient is φ = 65660898.

The previous prime is 65660897. The next prime is 65660921. The reversal of 65660899 is 99806656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65660899 - 2¹ = 65660897 is a prime.

It is a super-2 number, since 2×65660899² = 8622707314976402, which contains 22 as substring.

Together with 65660897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (65660891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32830449 + 32830450.

It is an arithmetic number, because the mean of its divisors is an integer number (32830450).

Almost surely, 2^65660899 is an apocalyptic number.

65660899 is a deficient number, since it is larger than the sum of its proper divisors (1).

65660899 is an equidigital number, since it uses as much as digits as its factorization.

65660899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 65660899 is about 8103.1413044572. The cubic root of 65660899 is about 403.4306979083.

The spelling of 65660899 in words is "sixty-five million, six hundred sixty thousand, eight hundred ninety-nine".