16621817354 has 16 divisors (see below), whose sum is σ = 26403625728. Its totient is φ = 7820766912.

The previous prime is 16621817351. The next prime is 16621817389. The reversal of 16621817354 is 45371812661.

16621817354 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16621817354² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16621817351) 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, 193799 + ... + 266085.

It is an arithmetic number, because the mean of its divisors is an integer number (1650226608).

Almost surely, 2^16621817354 is an apocalyptic number.

16621817354 is a deficient number, since it is larger than the sum of its proper divisors (9781808374).

16621817354 is a wasteful number, since it uses less digits than its factorization.

16621817354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79069.

The product of its digits is 241920, while the sum is 44.

The spelling of 16621817354 in words is "sixteen billion, six hundred twenty-one million, eight hundred seventeen thousand, three hundred fifty-four".