16688621998 has 8 divisors (see below), whose sum is σ = 25035752808. Its totient is φ = 8343371064.

The previous prime is 16688621977. The next prime is 16688622007. The reversal of 16688621998 is 89912688661.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447561 + ... + 483412.

It is an arithmetic number, because the mean of its divisors is an integer number (3129469101).

Almost surely, 2^16688621998 is an apocalyptic number.

16688621998 is a deficient number, since it is larger than the sum of its proper divisors (8347130810).

16688621998 is an equidigital number, since it uses as much as digits as its factorization.

16688621998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939938.

The product of its digits is 17915904, while the sum is 64.

The spelling of 16688621998 in words is "sixteen billion, six hundred eighty-eight million, six hundred twenty-one thousand, nine hundred ninety-eight".