66222501 has 4 divisors (see below), whose sum is σ = 88296672. Its totient is φ = 44148332.

The previous prime is 66222487. The next prime is 66222509. The reversal of 66222501 is 10522266.

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 a de Polignac number, because none of the positive numbers 2^k-66222501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66222509) 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, 11037081 + ... + 11037086.

It is an arithmetic number, because the mean of its divisors is an integer number (22074168).

Almost surely, 2^66222501 is an apocalyptic number.

It is an amenable number.

66222501 is a deficient number, since it is larger than the sum of its proper divisors (22074171).

66222501 is a wasteful number, since it uses less digits than its factorization.

66222501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22074170.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 66222501 is about 8137.7208725785. The cubic root of 66222501 is about 404.5776239750.

Adding to 66222501 its reverse (10522266), we get a palindrome (76744767).

The spelling of 66222501 in words is "sixty-six million, two hundred twenty-two thousand, five hundred one".