66673801 has 2 divisors, whose sum is σ = 66673802. Its totient is φ = 66673800.

The previous prime is 66673787. The next prime is 66673807. The reversal of 66673801 is 10837666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65221776 + 1452025 = 8076^2 + 1205^2 .

It is a cyclic number.

It is not a de Polignac number, because 66673801 - 2⁵ = 66673769 is a prime.

It is not a weakly prime, because it can be changed into another prime (66673807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336900 + 33336901.

It is an arithmetic number, because the mean of its divisors is an integer number (33336901).

Almost surely, 2^66673801 is an apocalyptic number.

It is an amenable number.

66673801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66673801 is an equidigital number, since it uses as much as digits as its factorization.

66673801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 66673801 is about 8165.4026844976. The cubic root of 66673801 is about 405.4945966744.

The spelling of 66673801 in words is "sixty-six million, six hundred seventy-three thousand, eight hundred one".