39987863801 has 2 divisors, whose sum is σ = 39987863802. Its totient is φ = 39987863800.

The previous prime is 39987863749. The next prime is 39987863807. The reversal of 39987863801 is 10836878993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39688608400 + 299255401 = 199220^2 + 17299^2 .

It is an emirp because it is prime and its reverse (10836878993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39987863801 - 2¹⁸ = 39987601657 is a prime.

It is not a weakly prime, because it can be changed into another prime (39987863807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19993931900 + 19993931901.

It is an arithmetic number, because the mean of its divisors is an integer number (19993931901).

Almost surely, 2^39987863801 is an apocalyptic number.

It is an amenable number.

39987863801 is a deficient number, since it is larger than the sum of its proper divisors (1).

39987863801 is an equidigital number, since it uses as much as digits as its factorization.

39987863801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 39987863801 in words is "thirty-nine billion, nine hundred eighty-seven million, eight hundred sixty-three thousand, eight hundred one".