65805979 has 4 divisors (see below), whose sum is σ = 66444976. Its totient is φ = 65166984.

The previous prime is 65805937. The next prime is 65805983. The reversal of 65805979 is 97950856.

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 65805979 - 2⁷ = 65805851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65805679) 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, 319344 + ... + 319549.

It is an arithmetic number, because the mean of its divisors is an integer number (16611244).

Almost surely, 2^65805979 is an apocalyptic number.

65805979 is a deficient number, since it is larger than the sum of its proper divisors (638997).

65805979 is a wasteful number, since it uses less digits than its factorization.

65805979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638996.

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 65805979 is about 8112.0884487288. The cubic root of 65805979 is about 403.7276106401.

The spelling of 65805979 in words is "sixty-five million, eight hundred five thousand, nine hundred seventy-nine".