16621801024 has 14 divisors (see below), whose sum is σ = 32983886534. Its totient is φ = 8310900480.

The previous prime is 16621800997. The next prime is 16621801033. The reversal of 16621801024 is 42010812661.

It can be written as a sum of positive squares in only one way, i.e., 12823297600 + 3798503424 = 113240^2 + 61632^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129857757 + ... + 129857884.

Almost surely, 2^16621801024 is an apocalyptic number.

It is an amenable number.

16621801024 is a deficient number, since it is larger than the sum of its proper divisors (16362085510).

16621801024 is an equidigital number, since it uses as much as digits as its factorization.

16621801024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259715653 (or 259715643 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 16621801024 in words is "sixteen billion, six hundred twenty-one million, eight hundred one thousand, twenty-four".