42651720581 has 8 divisors (see below), whose sum is σ = 44982402720. Its totient is φ = 40329623952.

The previous prime is 42651720541. The next prime is 42651720607. The reversal of 42651720581 is 18502715624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42651720581 - 2²² = 42647526277 is a prime.

It is a super-3 number, since 3×42651720581³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42651720541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2136170 + ... + 2156043.

It is an arithmetic number, because the mean of its divisors is an integer number (5622800340).

Almost surely, 2^42651720581 is an apocalyptic number.

It is an amenable number.

42651720581 is a deficient number, since it is larger than the sum of its proper divisors (2330682139).

42651720581 is a wasteful number, since it uses less digits than its factorization.

42651720581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292755.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 42651720581 in words is "forty-two billion, six hundred fifty-one million, seven hundred twenty thousand, five hundred eighty-one".