42642335977 has 2 divisors, whose sum is σ = 42642335978. Its totient is φ = 42642335976.

The previous prime is 42642335971. The next prime is 42642336001. The reversal of 42642335977 is 77953324624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38235500521 + 4406835456 = 195539^2 + 66384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42642335977 is a prime.

It is not a weakly prime, because it can be changed into another prime (42642335971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21321167988 + 21321167989.

It is an arithmetic number, because the mean of its divisors is an integer number (21321167989).

Almost surely, 2^42642335977 is an apocalyptic number.

It is an amenable number.

42642335977 is a deficient number, since it is larger than the sum of its proper divisors (1).

42642335977 is an equidigital number, since it uses as much as digits as its factorization.

42642335977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 52.

It can be divided in two parts, 426423 and 35977, that added together give a square (462400 = 680²).

The spelling of 42642335977 in words is "forty-two billion, six hundred forty-two million, three hundred thirty-five thousand, nine hundred seventy-seven".