66996565 has 16 divisors (see below), whose sum is σ = 86068800. Its totient is φ = 49911552.

The previous prime is 66996557. The next prime is 66996569. The reversal of 66996565 is 56569966.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66996565 - 2³ = 66996557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66996569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (5379300).

Almost surely, 2^66996565 is an apocalyptic number.

It is an amenable number.

66996565 is a deficient number, since it is larger than the sum of its proper divisors (19072235).

66996565 is a wasteful number, since it uses less digits than its factorization.

66996565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12036.

The product of its digits is 2624400, while the sum is 52.

The square root of 66996565 is about 8185.1429431623. The cubic root of 66996565 is about 406.1478689221.

The spelling of 66996565 in words is "sixty-six million, nine hundred ninety-six thousand, five hundred sixty-five".