66913583 has 4 divisors (see below), whose sum is σ = 72996648. Its totient is φ = 60830520.

The previous prime is 66913579. The next prime is 66913591. The reversal of 66913583 is 38531966.

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 66913583 - 2² = 66913579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66913583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66913543) 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, 3041516 + ... + 3041537.

It is an arithmetic number, because the mean of its divisors is an integer number (18249162).

Almost surely, 2^66913583 is an apocalyptic number.

66913583 is a deficient number, since it is larger than the sum of its proper divisors (6083065).

66913583 is a wasteful number, since it uses less digits than its factorization.

66913583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083064.

The product of its digits is 116640, while the sum is 41.

The square root of 66913583 is about 8180.0723101938. The cubic root of 66913583 is about 405.9801146157.

The spelling of 66913583 in words is "sixty-six million, nine hundred thirteen thousand, five hundred eighty-three".