65994577843 has 4 divisors (see below), whose sum is σ = 67778215120. Its totient is φ = 64210940568.

The previous prime is 65994577801. The next prime is 65994577861. The reversal of 65994577843 is 34877549956.

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 65994577843 - 2²¹ = 65992480691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65994572843) 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 3 ways as a sum of consecutive naturals, for example, 891818583 + ... + 891818656.

It is an arithmetic number, because the mean of its divisors is an integer number (16944553780).

Almost surely, 2^65994577843 is an apocalyptic number.

65994577843 is a deficient number, since it is larger than the sum of its proper divisors (1783637277).

65994577843 is a wasteful number, since it uses less digits than its factorization.

65994577843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783637276.

The product of its digits is 228614400, while the sum is 67.

The spelling of 65994577843 in words is "sixty-five billion, nine hundred ninety-four million, five hundred seventy-seven thousand, eight hundred forty-three".