39987685811 has 2 divisors, whose sum is σ = 39987685812. Its totient is φ = 39987685810.

The previous prime is 39987685733. The next prime is 39987685831. The reversal of 39987685811 is 11858678993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39987685811 - 2¹⁰ = 39987684787 is a prime.

It is not a weakly prime, because it can be changed into another prime (39987685831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19993842905 + 19993842906.

It is an arithmetic number, because the mean of its divisors is an integer number (19993842906).

Almost surely, 2^39987685811 is an apocalyptic number.

39987685811 is a deficient number, since it is larger than the sum of its proper divisors (1).

39987685811 is an equidigital number, since it uses as much as digits as its factorization.

39987685811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 65.

The spelling of 39987685811 in words is "thirty-nine billion, nine hundred eighty-seven million, six hundred eighty-five thousand, eight hundred eleven".