66122869 has 4 divisors (see below), whose sum is σ = 69603040. Its totient is φ = 62642700.

The previous prime is 66122867. The next prime is 66122879. The reversal of 66122869 is 96822166.

It is a happy number.

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 66122869 - 2¹ = 66122867 is a prime.

It is a super-2 number, since 2×66122869² = 8744467609582322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66122867) 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, 1740057 + ... + 1740094.

It is an arithmetic number, because the mean of its divisors is an integer number (17400760).

Almost surely, 2^66122869 is an apocalyptic number.

It is an amenable number.

66122869 is a deficient number, since it is larger than the sum of its proper divisors (3480171).

66122869 is a wasteful number, since it uses less digits than its factorization.

66122869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480170.

The product of its digits is 62208, while the sum is 40.

The square root of 66122869 is about 8131.5969526287. The cubic root of 66122869 is about 404.3746259553.

The spelling of 66122869 in words is "sixty-six million, one hundred twenty-two thousand, eight hundred sixty-nine".