667878793 has 2 divisors, whose sum is σ = 667878794. Its totient is φ = 667878792.

The previous prime is 667878773. The next prime is 667878797. The reversal of 667878793 is 397878766.

667878793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 546063424 + 121815369 = 23368^2 + 11037^2 .

It is a cyclic number.

It is not a de Polignac number, because 667878793 - 2¹³ = 667870601 is a prime.

It is not a weakly prime, because it can be changed into another prime (667878797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333939396 + 333939397.

It is an arithmetic number, because the mean of its divisors is an integer number (333939397).

Almost surely, 2^667878793 is an apocalyptic number.

It is an amenable number.

667878793 is a deficient number, since it is larger than the sum of its proper divisors (1).

667878793 is an equidigital number, since it uses as much as digits as its factorization.

667878793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 61.

The square root of 667878793 is about 25843.3510404514. The cubic root of 667878793 is about 874.1095891257.

The spelling of 667878793 in words is "six hundred sixty-seven million, eight hundred seventy-eight thousand, seven hundred ninety-three".