66070621 has 8 divisors (see below), whose sum is σ = 67226040. Its totient is φ = 64922112.

The previous prime is 66070601. The next prime is 66070649. The reversal of 66070621 is 12607066.

66070621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 43744996 + 22325625 = 6614^2 + 4725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66070621 - 2²³ = 57682013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66070621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66070601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19845 + ... + 22933.

It is an arithmetic number, because the mean of its divisors is an integer number (8403255).

Almost surely, 2^66070621 is an apocalyptic number.

It is an amenable number.

66070621 is a deficient number, since it is larger than the sum of its proper divisors (1155419).

66070621 is a wasteful number, since it uses less digits than its factorization.

66070621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3455.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 66070621 is about 8128.3836646654. The cubic root of 66070621 is about 404.2680902840.

Adding to 66070621 its reverse (12607066), we get a palindrome (78677687).

The spelling of 66070621 in words is "sixty-six million, seventy thousand, six hundred twenty-one".