65959866 has 64 divisors (see below), whose sum is σ = 168514560. Its totient is φ = 18733680.

The previous prime is 65959853. The next prime is 65959879. The reversal of 65959866 is 66895956.

It is an interprime number because it is at equal distance from previous prime (65959853) and next prime (65959879).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79345 + ... + 80171.

It is an arithmetic number, because the mean of its divisors is an integer number (2633040).

Almost surely, 2^65959866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65959866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84257280).

65959866 is an abundant number, since it is smaller than the sum of its proper divisors (102554694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65959866 is a wasteful number, since it uses less digits than its factorization.

65959866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1050 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 65959866 is about 8121.5679520644. The cubic root of 65959866 is about 404.0420707421.

It can be divided in two parts, 6595 and 9866, that added together give a palindrome (16461).

The spelling of 65959866 in words is "sixty-five million, nine hundred fifty-nine thousand, eight hundred sixty-six".