42036771681 has 6 divisors (see below), whose sum is σ = 60719781330. Its totient is φ = 28024514448.

The previous prime is 42036771661. The next prime is 42036771719. The reversal of 42036771681 is 18617763024.

42036771681 is a `hidden beast` number, since 420 + 3 + 67 + 7 + 168 + 1 = 666.

42036771681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 41818205025 + 218566656 = 204495^2 + 14784^2 .

It is not a de Polignac number, because 42036771681 - 2⁵ = 42036771649 is a prime.

It is a super-2 number, since 2×42036771681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42036771661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2335376196 + ... + 2335376213.

It is an arithmetic number, because the mean of its divisors is an integer number (10119963555).

Almost surely, 2^42036771681 is an apocalyptic number.

It is an amenable number.

42036771681 is a deficient number, since it is larger than the sum of its proper divisors (18683009649).

42036771681 is a wasteful number, since it uses less digits than its factorization.

42036771681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4670752415 (or 4670752412 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 42036771681 in words is "forty-two billion, thirty-six million, seven hundred seventy-one thousand, six hundred eighty-one".