39920641963 has 2 divisors, whose sum is σ = 39920641964. Its totient is φ = 39920641962.

The previous prime is 39920641883. The next prime is 39920641987. The reversal of 39920641963 is 36914602993.

It is a strong prime.

It is an emirp because it is prime and its reverse (36914602993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39920641963 - 2¹³ = 39920633771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39920641963.

It is not a weakly prime, because it can be changed into another prime (39920641363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19960320981 + 19960320982.

It is an arithmetic number, because the mean of its divisors is an integer number (19960320982).

Almost surely, 2^39920641963 is an apocalyptic number.

39920641963 is a deficient number, since it is larger than the sum of its proper divisors (1).

39920641963 is an equidigital number, since it uses as much as digits as its factorization.

39920641963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 52.

The spelling of 39920641963 in words is "thirty-nine billion, nine hundred twenty million, six hundred forty-one thousand, nine hundred sixty-three".