42762781669 has 2 divisors, whose sum is σ = 42762781670. Its totient is φ = 42762781668.

The previous prime is 42762781651. The next prime is 42762781673. The reversal of 42762781669 is 96618726724.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42594768225 + 168013444 = 206385^2 + 12962^2 .

It is a cyclic number.

It is not a de Polignac number, because 42762781669 - 2⁵ = 42762781637 is a prime.

It is a super-2 number, since 2×42762781669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42762781609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21381390834 + 21381390835.

It is an arithmetic number, because the mean of its divisors is an integer number (21381390835).

Almost surely, 2^42762781669 is an apocalyptic number.

It is an amenable number.

42762781669 is a deficient number, since it is larger than the sum of its proper divisors (1).

42762781669 is an equidigital number, since it uses as much as digits as its factorization.

42762781669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 58.

The spelling of 42762781669 in words is "forty-two billion, seven hundred sixty-two million, seven hundred eighty-one thousand, six hundred sixty-nine".