66761143 has 2 divisors, whose sum is σ = 66761144. Its totient is φ = 66761142.

The previous prime is 66761129. The next prime is 66761153. The reversal of 66761143 is 34116766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66761143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66761099 and 66761108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66761153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33380571 + 33380572.

It is an arithmetic number, because the mean of its divisors is an integer number (33380572).

Almost surely, 2^66761143 is an apocalyptic number.

66761143 is a deficient number, since it is larger than the sum of its proper divisors (1).

66761143 is an equidigital number, since it uses as much as digits as its factorization.

66761143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 66761143 is about 8170.7492312517. The cubic root of 66761143 is about 405.6715840098.

The spelling of 66761143 in words is "sixty-six million, seven hundred sixty-one thousand, one hundred forty-three".