65779969 has 8 divisors (see below), whose sum is σ = 67789568. Its totient is φ = 63782640.

The previous prime is 65779939. The next prime is 65779991. The reversal of 65779969 is 96997756.

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 65779969 - 2⁵ = 65779937 is a prime.

It is a super-2 number, since 2×65779969² = 8654008643281922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65779939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8464 + ... + 14254.

It is an arithmetic number, because the mean of its divisors is an integer number (8473696).

Almost surely, 2^65779969 is an apocalyptic number.

It is an amenable number.

65779969 is a deficient number, since it is larger than the sum of its proper divisors (2009599).

65779969 is a wasteful number, since it uses less digits than its factorization.

65779969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6135.

The product of its digits is 6429780, while the sum is 58.

The square root of 65779969 is about 8110.4851272905. The cubic root of 65779969 is about 403.6744121358.

The spelling of 65779969 in words is "sixty-five million, seven hundred seventy-nine thousand, nine hundred sixty-nine".