16506145555 has 4 divisors (see below), whose sum is σ = 19807374672. Its totient is φ = 13204916440.

The previous prime is 16506145543. The next prime is 16506145571. The reversal of 16506145555 is 55554160561.

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

It is not a de Polignac number, because 16506145555 - 2⁹ = 16506145043 is a prime.

It is a Duffinian 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, 1650614551 + ... + 1650614560.

It is an arithmetic number, because the mean of its divisors is an integer number (4951843668).

Almost surely, 2^16506145555 is an apocalyptic number.

16506145555 is a deficient number, since it is larger than the sum of its proper divisors (3301229117).

16506145555 is an equidigital number, since it uses as much as digits as its factorization.

16506145555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301229116.

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 16506145555 in words is "sixteen billion, five hundred six million, one hundred forty-five thousand, five hundred fifty-five".