64222661 has 4 divisors (see below), whose sum is σ = 64996512. Its totient is φ = 63448812.

The previous prime is 64222637. The next prime is 64222681. The reversal of 64222661 is 16622246.

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 64222661 - 2⁶ = 64222597 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 (64222681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386801 + ... + 386966.

It is an arithmetic number, because the mean of its divisors is an integer number (16249128).

Almost surely, 2^64222661 is an apocalyptic number.

It is an amenable number.

64222661 is a deficient number, since it is larger than the sum of its proper divisors (773851).

64222661 is an equidigital number, since it uses as much as digits as its factorization.

64222661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773850.

The product of its digits is 6912, while the sum is 29.

The square root of 64222661 is about 8013.9042295251. The cubic root of 64222661 is about 400.4633401658.

The spelling of 64222661 in words is "sixty-four million, two hundred twenty-two thousand, six hundred sixty-one".