39942563501 has 2 divisors, whose sum is σ = 39942563502. Its totient is φ = 39942563500.

The previous prime is 39942563489. The next prime is 39942563543. The reversal of 39942563501 is 10536524993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22366698025 + 17575865476 = 149555^2 + 132574^2 .

It is a cyclic number.

It is not a de Polignac number, because 39942563501 - 2¹⁰ = 39942562477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39942562501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19971281750 + 19971281751.

It is an arithmetic number, because the mean of its divisors is an integer number (19971281751).

Almost surely, 2^39942563501 is an apocalyptic number.

It is an amenable number.

39942563501 is a deficient number, since it is larger than the sum of its proper divisors (1).

39942563501 is an equidigital number, since it uses as much as digits as its factorization.

39942563501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 47.

The spelling of 39942563501 in words is "thirty-nine billion, nine hundred forty-two million, five hundred sixty-three thousand, five hundred one".