65997667 has 8 divisors (see below), whose sum is σ = 69413760. Its totient is φ = 62662080.

The previous prime is 65997653. The next prime is 65997691. The reversal of 65997667 is 76679956.

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 65997667 - 2¹⁹ = 65473379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65997067) 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, 18442 + ... + 21727.

It is an arithmetic number, because the mean of its divisors is an integer number (8676720).

Almost surely, 2^65997667 is an apocalyptic number.

65997667 is a deficient number, since it is larger than the sum of its proper divisors (3416093).

65997667 is a wasteful number, since it uses less digits than its factorization.

65997667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40253.

The product of its digits is 4286520, while the sum is 55.

The square root of 65997667 is about 8123.8948171428. The cubic root of 65997667 is about 404.1192402824.

The spelling of 65997667 in words is "sixty-five million, nine hundred ninety-seven thousand, six hundred sixty-seven".