16019205489 has 105 divisors (see below), whose sum is σ = 28615751131. Its totient is φ = 8930567520.

The previous prime is 16019205469. The next prime is 16019205511. The reversal of 16019205489 is 98450291061.

The square root of 16019205489 is 126567.

It is a perfect power (a square), and thus also a powerful number.

16019205489 is a `hidden beast` number, since 16 + 0 + 1 + 92 + 0 + 548 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 771895089 + 15247310400 = 27783^2 + 123480^2 .

It is not a de Polignac number, because 16019205489 - 2⁵ = 16019205457 is a prime.

It is a super-2 number, since 2×16019205489² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16019205469) by changing a digit.

It is a polite number, since it can be written in 104 ways as a sum of consecutive naturals, for example, 390712309 + ... + 390712349.

Almost surely, 2^16019205489 is an apocalyptic number.

16019205489 is the 126567-th square number.

16019205489 is the 63284-th centered octagonal number.

It is an amenable number.

16019205489 is a deficient number, since it is larger than the sum of its proper divisors (12596545642).

16019205489 is an frugal number, since it uses more digits than its factorization.

16019205489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 16019205489 in words is "sixteen billion, nineteen million, two hundred five thousand, four hundred eighty-nine".