66670693 has 4 divisors (see below), whose sum is σ = 66744160. Its totient is φ = 66597228.

The previous prime is 66670691. The next prime is 66670699. The reversal of 66670693 is 39607666.

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 66670693 - 2¹ = 66670691 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 (66670691) 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, 35355 + ... + 37192.

It is an arithmetic number, because the mean of its divisors is an integer number (16686040).

Almost surely, 2^66670693 is an apocalyptic number.

It is an amenable number.

66670693 is a deficient number, since it is larger than the sum of its proper divisors (73467).

66670693 is an equidigital number, since it uses as much as digits as its factorization.

66670693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73466.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 66670693 is about 8165.2123671096. The cubic root of 66670693 is about 405.4882958648.

The spelling of 66670693 in words is "sixty-six million, six hundred seventy thousand, six hundred ninety-three".