66124421 has 4 divisors (see below), whose sum is σ = 72135744. Its totient is φ = 60113100.

The previous prime is 66124417. The next prime is 66124433. The reversal of 66124421 is 12442166.

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 66124421 - 2² = 66124417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66124481) 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, 3005645 + ... + 3005666.

It is an arithmetic number, because the mean of its divisors is an integer number (18033936).

Almost surely, 2^66124421 is an apocalyptic number.

It is an amenable number.

66124421 is a deficient number, since it is larger than the sum of its proper divisors (6011323).

66124421 is a wasteful number, since it uses less digits than its factorization.

66124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6011322.

The product of its digits is 2304, while the sum is 26.

The square root of 66124421 is about 8131.6923822781. The cubic root of 66124421 is about 404.3777896843.

Adding to 66124421 its reverse (12442166), we get a palindrome (78566587).

The spelling of 66124421 in words is "sixty-six million, one hundred twenty-four thousand, four hundred twenty-one".