16561016619 has 24 divisors (see below), whose sum is σ = 25702539408. Its totient is φ = 9457519680.

The previous prime is 16561016617. The next prime is 16561016713. The reversal of 16561016619 is 91661016561.

It is not a de Polignac number, because 16561016619 - 2¹ = 16561016617 is a prime.

It is a super-2 number, since 2×16561016619² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16561016617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206229 + ... + 275049.

It is an arithmetic number, because the mean of its divisors is an integer number (1070939142).

Almost surely, 2^16561016619 is an apocalyptic number.

16561016619 is a deficient number, since it is larger than the sum of its proper divisors (9141522789).

16561016619 is a wasteful number, since it uses less digits than its factorization.

16561016619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70475 (or 70468 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 42.

The spelling of 16561016619 in words is "sixteen billion, five hundred sixty-one million, sixteen thousand, six hundred nineteen".