16615376643 has 4 divisors (see below), whose sum is σ = 22153835528. Its totient is φ = 11076917760.

The previous prime is 16615376587. The next prime is 16615376653. The reversal of 16615376643 is 34667351661.

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

It is not a de Polignac number, because 16615376643 - 2¹⁶ = 16615311107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16615376592 and 16615376601.

It is not an unprimeable number, because it can be changed into a prime (16615376653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2769229438 + ... + 2769229443.

It is an arithmetic number, because the mean of its divisors is an integer number (5538458882).

Almost surely, 2^16615376643 is an apocalyptic number.

16615376643 is a deficient number, since it is larger than the sum of its proper divisors (5538458885).

16615376643 is an equidigital number, since it uses as much as digits as its factorization.

16615376643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538458884.

The product of its digits is 1632960, while the sum is 48.

The spelling of 16615376643 in words is "sixteen billion, six hundred fifteen million, three hundred seventy-six thousand, six hundred forty-three".