39976643687 has 2 divisors, whose sum is σ = 39976643688. Its totient is φ = 39976643686.

The previous prime is 39976643683. The next prime is 39976643699. The reversal of 39976643687 is 78634667993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39976643687 - 2² = 39976643683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39976643683) 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, 19988321843 + 19988321844.

It is an arithmetic number, because the mean of its divisors is an integer number (19988321844).

Almost surely, 2^39976643687 is an apocalyptic number.

39976643687 is a deficient number, since it is larger than the sum of its proper divisors (1).

39976643687 is an equidigital number, since it uses as much as digits as its factorization.

39976643687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 246903552, while the sum is 68.

The spelling of 39976643687 in words is "thirty-nine billion, nine hundred seventy-six million, six hundred forty-three thousand, six hundred eighty-seven".