16661124376654 has 4 divisors (see below), whose sum is σ = 24991686564984. Its totient is φ = 8330562188326.

The previous prime is 16661124376613. The next prime is 16661124376703. The reversal of 16661124376654 is 45667342116661.

It is a happy number.

16661124376654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4165281094162 + ... + 4165281094165.

It is an arithmetic number, because the mean of its divisors is an integer number (6247921641246).

Almost surely, 2^{16661124376654} is an apocalyptic number.

16661124376654 is a deficient number, since it is larger than the sum of its proper divisors (8330562188330).

16661124376654 is an equidigital number, since it uses as much as digits as its factorization.

16661124376654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8330562188329.

The product of its digits is 26127360, while the sum is 58.

The spelling of 16661124376654 in words is "sixteen trillion, six hundred sixty-one billion, one hundred twenty-four million, three hundred seventy-six thousand, six hundred fifty-four".