42887813767261 has 2 divisors, whose sum is σ = 42887813767262. Its totient is φ = 42887813767260.

The previous prime is 42887813767247. The next prime is 42887813767297. The reversal of 42887813767261 is 16276731878824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28462022270361 + 14425791496900 = 5334981^2 + 3798130^2 .

It is a cyclic number.

It is not a de Polignac number, because 42887813767261 - 2¹⁹ = 42887813242973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42887813767961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21443906883630 + 21443906883631.

It is an arithmetic number, because the mean of its divisors is an integer number (21443906883631).

Almost surely, 2^{42887813767261} is an apocalyptic number.

It is an amenable number.

42887813767261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42887813767261 is an equidigital number, since it uses as much as digits as its factorization.

42887813767261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 303464448, while the sum is 70.

The spelling of 42887813767261 in words is "forty-two trillion, eight hundred eighty-seven billion, eight hundred thirteen million, seven hundred sixty-seven thousand, two hundred sixty-one".