42687145561 has 8 divisors (see below), whose sum is σ = 43176499200. Its totient is φ = 42198008160.

The previous prime is 42687145513. The next prime is 42687145577. The reversal of 42687145561 is 16554178624.

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 42687145561 - 2⁷ = 42687145433 is a prime.

It is a super-3 number, since 3×42687145561³ (a number of 33 digits) contains 333 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 (42687145661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361176 + ... + 464566.

It is an arithmetic number, because the mean of its divisors is an integer number (5397062400).

Almost surely, 2^42687145561 is an apocalyptic number.

It is an amenable number.

42687145561 is a deficient number, since it is larger than the sum of its proper divisors (489353639).

42687145561 is a wasteful number, since it uses less digits than its factorization.

42687145561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108119.

The product of its digits is 1612800, while the sum is 49.

The spelling of 42687145561 in words is "forty-two billion, six hundred eighty-seven million, one hundred forty-five thousand, five hundred sixty-one".