66960461 has 2 divisors, whose sum is σ = 66960462. Its totient is φ = 66960460.

The previous prime is 66960431. The next prime is 66960511. The reversal of 66960461 is 16406966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 2157961 = 8050^2 + 1469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66960461 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66960401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33480230 + 33480231.

It is an arithmetic number, because the mean of its divisors is an integer number (33480231).

Almost surely, 2^66960461 is an apocalyptic number.

It is an amenable number.

66960461 is a deficient number, since it is larger than the sum of its proper divisors (1).

66960461 is an equidigital number, since it uses as much as digits as its factorization.

66960461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 66960461 is about 8182.9371866097. The cubic root of 66960461 is about 406.0748990244.

The spelling of 66960461 in words is "sixty-six million, nine hundred sixty thousand, four hundred sixty-one".