39778906666903 has 2 divisors, whose sum is σ = 39778906666904. Its totient is φ = 39778906666902.

The previous prime is 39778906666883. The next prime is 39778906666963. The reversal of 39778906666903 is 30966660987793.

It is a weak prime.

It is an emirp because it is prime and its reverse (30966660987793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39778906666903 - 2²¹ = 39778904569751 is a prime.

It is a super-2 number, since 2×39778906666903² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39778906666963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19889453333451 + 19889453333452.

It is an arithmetic number, because the mean of its divisors is an integer number (19889453333452).

Almost surely, 2^{39778906666903} is an apocalyptic number.

39778906666903 is a deficient number, since it is larger than the sum of its proper divisors (1).

39778906666903 is an equidigital number, since it uses as much as digits as its factorization.

39778906666903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3333197952, while the sum is 79.

The spelling of 39778906666903 in words is "thirty-nine trillion, seven hundred seventy-eight billion, nine hundred six million, six hundred sixty-six thousand, nine hundred three".