666078038323063 has 2 divisors, whose sum is σ = 666078038323064. Its totient is φ = 666078038323062.

The previous prime is 666078038323013. The next prime is 666078038323129. The reversal of 666078038323063 is 360323830870666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666078038323063 - 2³³ = 666069448388471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666078038322992 and 666078038323010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666078038323003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333039019161531 + 333039019161532.

It is an arithmetic number, because the mean of its divisors is an integer number (333039019161532).

Almost surely, 2^{666078038323063} is an apocalyptic number.

666078038323063 is a deficient number, since it is larger than the sum of its proper divisors (1).

666078038323063 is an equidigital number, since it uses as much as digits as its factorization.

666078038323063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94058496, while the sum is 61.

The spelling of 666078038323063 in words is "six hundred sixty-six trillion, seventy-eight billion, thirty-eight million, three hundred twenty-three thousand, sixty-three".