17421623664 has 40 divisors (see below), whose sum is σ = 47653266960. Its totient is φ = 5465607168.

The previous prime is 17421623633. The next prime is 17421623669. The reversal of 17421623664 is 46632612471.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17421623669) 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, 10674199 + ... + 10675830.

It is an arithmetic number, because the mean of its divisors is an integer number (1191331674).

Almost surely, 2^17421623664 is an apocalyptic number.

It is an amenable number.

17421623664 is an abundant number, since it is smaller than the sum of its proper divisors (30231643296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17421623664 is a wasteful number, since it uses less digits than its factorization.

17421623664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21350057 (or 21350051 counting only the distinct ones).

The product of its digits is 290304, while the sum is 42.

The spelling of 17421623664 in words is "seventeen billion, four hundred twenty-one million, six hundred twenty-three thousand, six hundred sixty-four".