65898299891 has 4 divisors (see below), whose sum is σ = 66004759800. Its totient is φ = 65791839984.

The previous prime is 65898299851. The next prime is 65898299893. The reversal of 65898299891 is 19899289856.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65898299891 - 2¹⁸ = 65898037747 is a prime.

It is a super-2 number, since 2×65898299891² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65898299893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53229026 + ... + 53230263.

It is an arithmetic number, because the mean of its divisors is an integer number (16501189950).

Almost surely, 2^65898299891 is an apocalyptic number.

65898299891 is a deficient number, since it is larger than the sum of its proper divisors (106459909).

65898299891 is a wasteful number, since it uses less digits than its factorization.

65898299891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106459908.

The product of its digits is 201553920, while the sum is 74.

The spelling of 65898299891 in words is "sixty-five billion, eight hundred ninety-eight million, two hundred ninety-nine thousand, eight hundred ninety-one".