16578365049 has 27 divisors (see below), whose sum is σ = 24184881487. Its totient is φ = 10943314944.

The previous prime is 16578365009. The next prime is 16578365113. The reversal of 16578365049 is 94056387561.

The square root of 16578365049 is 128757.

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

16578365049 is a `hidden beast` number, since 1 + 6 + 57 + 83 + 6 + 504 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16321340025 + 257025024 = 127755^2 + 16032^2 .

It is not a de Polignac number, because 16578365049 - 2⁷ = 16578364921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16578364986 and 16578365004.

It is not an unprimeable number, because it can be changed into a prime (16578365009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 64507129 + ... + 64507385.

Almost surely, 2^16578365049 is an apocalyptic number.

16578365049 is the 128757-th square number.

16578365049 is the 64379-th centered octagonal number.

It is an amenable number.

16578365049 is a deficient number, since it is larger than the sum of its proper divisors (7606516438).

16578365049 is an frugal number, since it uses more digits than its factorization.

16578365049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 16578365049 in words is "sixteen billion, five hundred seventy-eight million, three hundred sixty-five thousand, forty-nine".