66770421 has 4 divisors (see below), whose sum is σ = 89027232. Its totient is φ = 44513612.

The previous prime is 66770419. The next prime is 66770423. The reversal of 66770421 is 12407766.

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 an interprime number because it is at equal distance from previous prime (66770419) and next prime (66770423).

It is a cyclic number.

It is not a de Polignac number, because 66770421 - 2¹ = 66770419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66770423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11128401 + ... + 11128406.

It is an arithmetic number, because the mean of its divisors is an integer number (22256808).

Almost surely, 2^66770421 is an apocalyptic number.

It is an amenable number.

66770421 is a deficient number, since it is larger than the sum of its proper divisors (22256811).

66770421 is a wasteful number, since it uses less digits than its factorization.

66770421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22256810.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 66770421 is about 8171.3169685186. The cubic root of 66770421 is about 405.6903756124.

The spelling of 66770421 in words is "sixty-six million, seven hundred seventy thousand, four hundred twenty-one".