66948793 has 2 divisors, whose sum is σ = 66948794. Its totient is φ = 66948792.

The previous prime is 66948779. The next prime is 66948841. The reversal of 66948793 is 39784966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65237929 + 1710864 = 8077^2 + 1308^2 .

It is a cyclic number.

It is not a de Polignac number, because 66948793 - 2²¹ = 64851641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66948793.

It is not a weakly prime, because it can be changed into another prime (66948773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33474396 + 33474397.

It is an arithmetic number, because the mean of its divisors is an integer number (33474397).

Almost surely, 2^66948793 is an apocalyptic number.

It is an amenable number.

66948793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66948793 is an equidigital number, since it uses as much as digits as its factorization.

66948793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 52.

The square root of 66948793 is about 8182.2242086122. The cubic root of 66948793 is about 406.0513111882.

The spelling of 66948793 in words is "sixty-six million, nine hundred forty-eight thousand, seven hundred ninety-three".