66329261 has 2 divisors, whose sum is σ = 66329262. Its totient is φ = 66329260.

The previous prime is 66329233. The next prime is 66329273. The reversal of 66329261 is 16292366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42172036 + 24157225 = 6494^2 + 4915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66329261 is a prime.

It is a super-2 number, since 2×66329261² = 8799141729612242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66329161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33164630 + 33164631.

It is an arithmetic number, because the mean of its divisors is an integer number (33164631).

Almost surely, 2^66329261 is an apocalyptic number.

It is an amenable number.

66329261 is a deficient number, since it is larger than the sum of its proper divisors (1).

66329261 is an equidigital number, since it uses as much as digits as its factorization.

66329261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 66329261 is about 8144.2778071478. The cubic root of 66329261 is about 404.7949192868.

The spelling of 66329261 in words is "sixty-six million, three hundred twenty-nine thousand, two hundred sixty-one".