66325552421 has 4 divisors (see below), whose sum is σ = 66639891744. Its totient is φ = 66011213100.

The previous prime is 66325552417. The next prime is 66325552427. The reversal of 66325552421 is 12425552366.

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 66325552421 - 2² = 66325552417 is a prime.

It is a super-2 number, since 2×66325552421² (a number of 22 digits) 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 (66325552427) 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, 157169345 + ... + 157169766.

It is an arithmetic number, because the mean of its divisors is an integer number (16659972936).

Almost surely, 2^66325552421 is an apocalyptic number.

It is an amenable number.

66325552421 is a deficient number, since it is larger than the sum of its proper divisors (314339323).

66325552421 is a wasteful number, since it uses less digits than its factorization.

66325552421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314339322.

The product of its digits is 432000, while the sum is 41.

The spelling of 66325552421 in words is "sixty-six billion, three hundred twenty-five million, five hundred fifty-two thousand, four hundred twenty-one".