39661427815699 has 2 divisors, whose sum is σ = 39661427815700. Its totient is φ = 39661427815698.

The previous prime is 39661427815643. The next prime is 39661427815703. The reversal of 39661427815699 is 99651872416693.

It is a strong prime.

It is an emirp because it is prime and its reverse (99651872416693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39661427815699 - 2¹⁵ = 39661427782931 is a prime.

It is not a weakly prime, because it can be changed into another prime (39661427815619) 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, 19830713907849 + 19830713907850.

It is an arithmetic number, because the mean of its divisors is an integer number (19830713907850).

Almost surely, 2^{39661427815699} is an apocalyptic number.

39661427815699 is a deficient number, since it is larger than the sum of its proper divisors (1).

39661427815699 is an equidigital number, since it uses as much as digits as its factorization.

39661427815699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058158080, while the sum is 76.

The spelling of 39661427815699 in words is "thirty-nine trillion, six hundred sixty-one billion, four hundred twenty-seven million, eight hundred fifteen thousand, six hundred ninety-nine".