42002019977 has 2 divisors, whose sum is σ = 42002019978. Its totient is φ = 42002019976.

The previous prime is 42002019959. The next prime is 42002020057. The reversal of 42002019977 is 77991020024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41902499401 + 99520576 = 204701^2 + 9976^2 .

It is a cyclic number.

It is not a de Polignac number, because 42002019977 - 2¹⁰ = 42002018953 is a prime.

It is not a weakly prime, because it can be changed into another prime (42002019907) 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, 21001009988 + 21001009989.

It is an arithmetic number, because the mean of its divisors is an integer number (21001009989).

Almost surely, 2^42002019977 is an apocalyptic number.

It is an amenable number.

42002019977 is a deficient number, since it is larger than the sum of its proper divisors (1).

42002019977 is an equidigital number, since it uses as much as digits as its factorization.

42002019977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 42002019977 in words is "forty-two billion, two million, nineteen thousand, nine hundred seventy-seven".