42165640321 has 8 divisors (see below), whose sum is σ = 48192431040. Its totient is φ = 36139631568.

The previous prime is 42165640289. The next prime is 42165640381. The reversal of 42165640321 is 12304656124.

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 42165640321 - 2⁵ = 42165640289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42165640381) 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, 74986 + ... + 299923.

It is an arithmetic number, because the mean of its divisors is an integer number (6024053880).

Almost surely, 2^42165640321 is an apocalyptic number.

It is an amenable number.

42165640321 is a deficient number, since it is larger than the sum of its proper divisors (6026790719).

42165640321 is a wasteful number, since it uses less digits than its factorization.

42165640321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390983.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 42165640321 in words is "forty-two billion, one hundred sixty-five million, six hundred forty thousand, three hundred twenty-one".