66020601 has 4 divisors (see below), whose sum is σ = 88027472. Its totient is φ = 44013732.

The previous prime is 66020593. The next prime is 66020621. The reversal of 66020601 is 10602066.

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 not a de Polignac number, because 66020601 - 2³ = 66020593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66020621) 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, 11003431 + ... + 11003436.

It is an arithmetic number, because the mean of its divisors is an integer number (22006868).

Almost surely, 2^66020601 is an apocalyptic number.

It is an amenable number.

66020601 is a deficient number, since it is larger than the sum of its proper divisors (22006871).

66020601 is a wasteful number, since it uses less digits than its factorization.

66020601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22006870.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 66020601 is about 8125.3062096145. The cubic root of 66020601 is about 404.1660449536.

Adding to 66020601 its reverse (10602066), we get a palindrome (76622667).

The spelling of 66020601 in words is "sixty-six million, twenty thousand, six hundred one".