66990943 has 2 divisors, whose sum is σ = 66990944. Its totient is φ = 66990942.

The previous prime is 66990919. The next prime is 66990967. The reversal of 66990943 is 34909966.

It is a balanced prime because it is at equal distance from previous prime (66990919) and next prime (66990967).

It is a cyclic number.

It is not a de Polignac number, because 66990943 - 2²⁵ = 33436511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66990893 and 66990902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66900943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33495471 + 33495472.

It is an arithmetic number, because the mean of its divisors is an integer number (33495472).

Almost surely, 2^66990943 is an apocalyptic number.

66990943 is a deficient number, since it is larger than the sum of its proper divisors (1).

66990943 is an equidigital number, since it uses as much as digits as its factorization.

66990943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 66990943 is about 8184.7995088457. The cubic root of 66990943 is about 406.1365080054.

The spelling of 66990943 in words is "sixty-six million, nine hundred ninety thousand, nine hundred forty-three".