42556326661 has 8 divisors (see below), whose sum is σ = 46513177344. Its totient is φ = 38760980160.

The previous prime is 42556326647. The next prime is 42556326671. The reversal of 42556326661 is 16662365524.

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 42556326661 - 2¹⁵ = 42556293893 is a prime.

It is a super-2 number, since 2×42556326661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42556326611) 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, 40375495 + ... + 40376548.

It is an arithmetic number, because the mean of its divisors is an integer number (5814147168).

Almost surely, 2^42556326661 is an apocalyptic number.

It is an amenable number.

42556326661 is a deficient number, since it is larger than the sum of its proper divisors (3956850683).

42556326661 is a wasteful number, since it uses less digits than its factorization.

42556326661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80752091.

The product of its digits is 1555200, while the sum is 46.

The spelling of 42556326661 in words is "forty-two billion, five hundred fifty-six million, three hundred twenty-six thousand, six hundred sixty-one".