42840926681 has 16 divisors (see below), whose sum is σ = 49468473600. Its totient is φ = 36340697088.

The previous prime is 42840926677. The next prime is 42840926683. The reversal of 42840926681 is 18662904824.

It is a cyclic number.

It is not a de Polignac number, because 42840926681 - 2² = 42840926677 is a prime.

It is a super-2 number, since 2×42840926681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42840926683) 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 in 15 ways as a sum of consecutive naturals, for example, 1141625 + ... + 1178553.

It is an arithmetic number, because the mean of its divisors is an integer number (3091779600).

Almost surely, 2^42840926681 is an apocalyptic number.

It is an amenable number.

42840926681 is a deficient number, since it is larger than the sum of its proper divisors (6627546919).

42840926681 is a wasteful number, since it uses less digits than its factorization.

42840926681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38648.

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 42840926681 in words is "forty-two billion, eight hundred forty million, nine hundred twenty-six thousand, six hundred eighty-one".