66773137 has 2 divisors, whose sum is σ = 66773138. Its totient is φ = 66773136.

The previous prime is 66773131. The next prime is 66773153. The reversal of 66773137 is 73137766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65028096 + 1745041 = 8064^2 + 1321^2 .

It is a cyclic number.

It is not a de Polignac number, because 66773137 - 2³ = 66773129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66773137.

It is not a weakly prime, because it can be changed into another prime (66773131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33386568 + 33386569.

It is an arithmetic number, because the mean of its divisors is an integer number (33386569).

Almost surely, 2^66773137 is an apocalyptic number.

It is an amenable number.

66773137 is a deficient number, since it is larger than the sum of its proper divisors (1).

66773137 is an equidigital number, since it uses as much as digits as its factorization.

66773137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111132, while the sum is 40.

The square root of 66773137 is about 8171.4831579096. The cubic root of 66773137 is about 405.6958762523.

The spelling of 66773137 in words is "sixty-six million, seven hundred seventy-three thousand, one hundred thirty-seven".