42609791691 has 48 divisors (see below), whose sum is σ = 64851696000. Its totient is φ = 27953849088.

The previous prime is 42609791683. The next prime is 42609791779. The reversal of 42609791691 is 19619790624.

It is a happy number.

It is not a de Polignac number, because 42609791691 - 2³ = 42609791683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42609791621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4214160 + ... + 4224258.

It is an arithmetic number, because the mean of its divisors is an integer number (1351077000).

Almost surely, 2^42609791691 is an apocalyptic number.

42609791691 is a deficient number, since it is larger than the sum of its proper divisors (22241904309).

42609791691 is a wasteful number, since it uses less digits than its factorization.

42609791691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10390 (or 10378 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 42609791691 in words is "forty-two billion, six hundred nine million, seven hundred ninety-one thousand, six hundred ninety-one".