66340541 has 4 divisors (see below), whose sum is σ = 66356832. Its totient is φ = 66324252.

The previous prime is 66340517. The next prime is 66340543. The reversal of 66340541 is 14504366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66340541 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 (66340543) 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, 4040 + ... + 12206.

It is an arithmetic number, because the mean of its divisors is an integer number (16589208).

Almost surely, 2^66340541 is an apocalyptic number.

It is an amenable number.

66340541 is a deficient number, since it is larger than the sum of its proper divisors (16291).

66340541 is an equidigital number, since it uses as much as digits as its factorization.

66340541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16290.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66340541 is about 8144.9702884664. The cubic root of 66340541 is about 404.8178645541.

The spelling of 66340541 in words is "sixty-six million, three hundred forty thousand, five hundred forty-one".