16615061555 has 4 divisors (see below), whose sum is σ = 19938073872. Its totient is φ = 13292049240.

The previous prime is 16615061549. The next prime is 16615061569. The reversal of 16615061555 is 55516051661.

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

It is not a de Polignac number, because 16615061555 - 2¹⁰ = 16615060531 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, 1661506151 + ... + 1661506160.

It is an arithmetic number, because the mean of its divisors is an integer number (4984518468).

Almost surely, 2^16615061555 is an apocalyptic number.

16615061555 is a deficient number, since it is larger than the sum of its proper divisors (3323012317).

16615061555 is an equidigital number, since it uses as much as digits as its factorization.

16615061555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323012316.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 16615061555 in words is "sixteen billion, six hundred fifteen million, sixty-one thousand, five hundred fifty-five".