65667967 has 4 divisors (see below), whose sum is σ = 68523120. Its totient is φ = 62812816.

The previous prime is 65667947. The next prime is 65667997. The reversal of 65667967 is 76976656.

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

It is not a de Polignac number, because 65667967 - 2²³ = 57279359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65667947) 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, 1427542 + ... + 1427587.

It is an arithmetic number, because the mean of its divisors is an integer number (17130780).

Almost surely, 2^65667967 is an apocalyptic number.

65667967 is a deficient number, since it is larger than the sum of its proper divisors (2855153).

65667967 is a wasteful number, since it uses less digits than its factorization.

65667967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855152.

The product of its digits is 2857680, while the sum is 52.

The square root of 65667967 is about 8103.5774198807. The cubic root of 65667967 is about 403.4451730166.

The spelling of 65667967 in words is "sixty-five million, six hundred sixty-seven thousand, nine hundred sixty-seven".