65961779 has 8 divisors (see below), whose sum is σ = 71144640. Its totient is φ = 60794496.

The previous prime is 65961773. The next prime is 65961809. The reversal of 65961779 is 97716956.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65961779 - 2²⁴ = 49184563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65961773) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5819 + ... + 12875.

It is an arithmetic number, because the mean of its divisors is an integer number (8893080).

Almost surely, 2^65961779 is an apocalyptic number.

65961779 is a deficient number, since it is larger than the sum of its proper divisors (5182861).

65961779 is a wasteful number, since it uses less digits than its factorization.

65961779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7789.

The product of its digits is 714420, while the sum is 50.

The square root of 65961779 is about 8121.6857240354. The cubic root of 65961779 is about 404.0459767790.

The spelling of 65961779 in words is "sixty-five million, nine hundred sixty-one thousand, seven hundred seventy-nine".