66001541 has 2 divisors, whose sum is σ = 66001542. Its totient is φ = 66001540.

The previous prime is 66001447. The next prime is 66001547. The reversal of 66001541 is 14510066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 229441 = 8110^2 + 479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66001541 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 (66001547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000770 + 33000771.

It is an arithmetic number, because the mean of its divisors is an integer number (33000771).

Almost surely, 2^66001541 is an apocalyptic number.

It is an amenable number.

66001541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66001541 is an equidigital number, since it uses as much as digits as its factorization.

66001541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 66001541 is about 8124.1332460762. The cubic root of 66001541 is about 404.1271472655.

The spelling of 66001541 in words is "sixty-six million, one thousand, five hundred forty-one".