66039601 has 4 divisors (see below), whose sum is σ = 68910912. Its totient is φ = 63168292.

The previous prime is 66039599. The next prime is 66039607. The reversal of 66039601 is 10693066.

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.

It is a cyclic number.

It is not a de Polignac number, because 66039601 - 2¹ = 66039599 is a prime.

It is a super-2 number, since 2×66039601² = 8722457800478402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66039607) 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, 1435621 + ... + 1435666.

It is an arithmetic number, because the mean of its divisors is an integer number (17227728).

Almost surely, 2^66039601 is an apocalyptic number.

It is an amenable number.

66039601 is a deficient number, since it is larger than the sum of its proper divisors (2871311).

66039601 is a wasteful number, since it uses less digits than its factorization.

66039601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871310.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 66039601 is about 8126.4753122125. The cubic root of 66039601 is about 404.2048127433.

The spelling of 66039601 in words is "sixty-six million, thirty-nine thousand, six hundred one".