16621621552 has 10 divisors (see below), whose sum is σ = 32204391788. Its totient is φ = 8310810768.

The previous prime is 16621621547. The next prime is 16621621573. The reversal of 16621621552 is 25512612661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519425658 + ... + 519425689.

Almost surely, 2^16621621552 is an apocalyptic number.

It is an amenable number.

16621621552 is a deficient number, since it is larger than the sum of its proper divisors (15582770236).

16621621552 is a wasteful number, since it uses less digits than its factorization.

16621621552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038851355 (or 1038851349 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The spelling of 16621621552 in words is "sixteen billion, six hundred twenty-one million, six hundred twenty-one thousand, five hundred fifty-two".