66421205 has 16 divisors (see below), whose sum is σ = 80815104. Its totient is φ = 52403520.

The previous prime is 66421153. The next prime is 66421231. The reversal of 66421205 is 50212466.

It is not a de Polignac number, because 66421205 - 2⁶ = 66421141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149714 + ... + 150156.

It is an arithmetic number, because the mean of its divisors is an integer number (5050944).

Almost surely, 2^66421205 is an apocalyptic number.

It is an amenable number.

66421205 is a deficient number, since it is larger than the sum of its proper divisors (14393899).

66421205 is a wasteful number, since it uses less digits than its factorization.

66421205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 66421205 is about 8149.9205517600. The cubic root of 66421205 is about 404.9818718706.

The spelling of 66421205 in words is "sixty-six million, four hundred twenty-one thousand, two hundred five".