65813779 has 4 divisors (see below), whose sum is σ = 67344376. Its totient is φ = 64283184.

The previous prime is 65813773. The next prime is 65813791. The reversal of 65813779 is 97731856.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65813779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65813773) 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, 765234 + ... + 765319.

It is an arithmetic number, because the mean of its divisors is an integer number (16836094).

Almost surely, 2^65813779 is an apocalyptic number.

65813779 is a deficient number, since it is larger than the sum of its proper divisors (1530597).

65813779 is a wasteful number, since it uses less digits than its factorization.

65813779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530596.

The product of its digits is 317520, while the sum is 46.

The square root of 65813779 is about 8112.5691984722. The cubic root of 65813779 is about 403.7435613232.

The spelling of 65813779 in words is "sixty-five million, eight hundred thirteen thousand, seven hundred seventy-nine".