65899916890 has 16 divisors (see below), whose sum is σ = 118663175880. Its totient is φ = 26350338880.

The previous prime is 65899916881. The next prime is 65899916899. The reversal of 65899916890 is 9861999856.

It is an interprime number because it is at equal distance from previous prime (65899916881) and next prime (65899916899).

It can be written as a sum of positive squares in 4 ways, for example, as 54597462921 + 11302453969 = 233661^2 + 106313^2 .

It is a super-2 number, since 2×65899916890² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65899916899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1174705 + ... + 1229524.

Almost surely, 2^65899916890 is an apocalyptic number.

65899916890 is a deficient number, since it is larger than the sum of its proper divisors (52763258990).

65899916890 is a wasteful number, since it uses less digits than its factorization.

65899916890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406977.

The product of its (nonzero) digits is 75582720, while the sum is 70.

The spelling of 65899916890 in words is "sixty-five billion, eight hundred ninety-nine million, nine hundred sixteen thousand, eight hundred ninety".