66905773 has 4 divisors (see below), whose sum is σ = 72988128. Its totient is φ = 60823420.

The previous prime is 66905771. The next prime is 66905777. The reversal of 66905773 is 37750966.

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 66905773 - 2¹ = 66905771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66905771) 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, 3041161 + ... + 3041182.

It is an arithmetic number, because the mean of its divisors is an integer number (18247032).

Almost surely, 2^66905773 is an apocalyptic number.

It is an amenable number.

66905773 is a deficient number, since it is larger than the sum of its proper divisors (6082355).

66905773 is a wasteful number, since it uses less digits than its factorization.

66905773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6082354.

The product of its (nonzero) digits is 238140, while the sum is 43.

The square root of 66905773 is about 8179.5949166203. The cubic root of 66905773 is about 405.9643189784.

The spelling of 66905773 in words is "sixty-six million, nine hundred five thousand, seven hundred seventy-three".