42591645895681 has 16 divisors (see below), whose sum is σ = 44997986746368. Its totient is φ = 40253619344400.

The previous prime is 42591645895651. The next prime is 42591645895693. The reversal of 42591645895681 is 18659854619524.

It is a cyclic number.

It is not a de Polignac number, because 42591645895681 - 2⁵ = 42591645895649 is a prime.

It is a super-4 number, since 4×42591645895681⁴ (a number of 56 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42591645895621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30893905 + ... + 32243086.

It is an arithmetic number, because the mean of its divisors is an integer number (2812374171648).

Almost surely, 2^{42591645895681} is an apocalyptic number.

It is an amenable number.

42591645895681 is a deficient number, since it is larger than the sum of its proper divisors (2406340850687).

42591645895681 is a wasteful number, since it uses less digits than its factorization.

42591645895681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63137532.

The product of its digits is 746496000, while the sum is 73.

The spelling of 42591645895681 in words is "forty-two trillion, five hundred ninety-one billion, six hundred forty-five million, eight hundred ninety-five thousand, six hundred eighty-one".