66207701 has 4 divisors (see below), whose sum is σ = 75665952. Its totient is φ = 56749452.

The previous prime is 66207697. The next prime is 66207773. The reversal of 66207701 is 10770266.

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 66207701 - 2² = 66207697 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 (66207601) 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, 4729115 + ... + 4729128.

It is an arithmetic number, because the mean of its divisors is an integer number (18916488).

Almost surely, 2^66207701 is an apocalyptic number.

It is an amenable number.

66207701 is a deficient number, since it is larger than the sum of its proper divisors (9458251).

66207701 is an equidigital number, since it uses as much as digits as its factorization.

66207701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458250.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 66207701 is about 8136.8114762479. The cubic root of 66207701 is about 404.5474821810.

Adding to 66207701 its reverse (10770266), we get a palindrome (76977967).

The spelling of 66207701 in words is "sixty-six million, two hundred seven thousand, seven hundred one".