66164993 has 2 divisors, whose sum is σ = 66164994. Its totient is φ = 66164992.

The previous prime is 66164963. The next prime is 66165017. The reversal of 66164993 is 39946166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59105344 + 7059649 = 7688^2 + 2657^2 .

It is a cyclic number.

It is not a de Polignac number, because 66164993 - 2⁶ = 66164929 is a prime.

It is not a weakly prime, because it can be changed into another prime (66164933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082496 + 33082497.

It is an arithmetic number, because the mean of its divisors is an integer number (33082497).

Almost surely, 2^66164993 is an apocalyptic number.

It is an amenable number.

66164993 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164993 is an equidigital number, since it uses as much as digits as its factorization.

66164993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 44.

The square root of 66164993 is about 8134.1866833753. The cubic root of 66164993 is about 404.4604775480.

The spelling of 66164993 in words is "sixty-six million, one hundred sixty-four thousand, nine hundred ninety-three".