16221623654 has 16 divisors (see below), whose sum is σ = 25627188480. Its totient is φ = 7679697480.

The previous prime is 16221623647. The next prime is 16221623741. The reversal of 16221623654 is 45632612261.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46994 + ... + 186149.

It is an arithmetic number, because the mean of its divisors is an integer number (1601699280).

Almost surely, 2^16221623654 is an apocalyptic number.

16221623654 is a deficient number, since it is larger than the sum of its proper divisors (9405564826).

16221623654 is a wasteful number, since it uses less digits than its factorization.

16221623654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234995.

The product of its digits is 103680, while the sum is 38.

The spelling of 16221623654 in words is "sixteen billion, two hundred twenty-one million, six hundred twenty-three thousand, six hundred fifty-four".