163421667665 has 8 divisors (see below), whose sum is σ = 198468724608. Its totient is φ = 129162185200.

The previous prime is 163421667611. The next prime is 163421667667. The reversal of 163421667665 is 566766124361.

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

It is not a de Polignac number, because 163421667665 - 2²⁴ = 163404890449 is a prime.

It is a super-3 number, since 3×163421667665³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163421667667) 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, 196893161 + ... + 196893990.

It is an arithmetic number, because the mean of its divisors is an integer number (24808590576).

Almost surely, 2^163421667665 is an apocalyptic number.

It is an amenable number.

163421667665 is a deficient number, since it is larger than the sum of its proper divisors (35047056943).

163421667665 is an equidigital number, since it uses as much as digits as its factorization.

163421667665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393787239.

The product of its digits is 6531840, while the sum is 53.

The spelling of 163421667665 in words is "one hundred sixty-three billion, four hundred twenty-one million, six hundred sixty-seven thousand, six hundred sixty-five".