16642665049 has 8 divisors (see below), whose sum is σ = 17863039080. Its totient is φ = 15449112576.

The previous prime is 16642665047. The next prime is 16642665073. The reversal of 16642665049 is 94056624661.

It can be written as a sum of positive squares in 4 ways, for example, as 3523253449 + 13119411600 = 59357^2 + 114540^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16642665049 - 2¹ = 16642665047 is a prime.

It is a super-3 number, since 3×16642665049³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16642664993 and 16642665011.

It is not an unprimeable number, because it can be changed into a prime (16642665047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6704104 + ... + 6706585.

It is an arithmetic number, because the mean of its divisors is an integer number (2232879885).

Almost surely, 2^16642665049 is an apocalyptic number.

It is an amenable number.

16642665049 is a deficient number, since it is larger than the sum of its proper divisors (1220374031).

16642665049 is a wasteful number, since it uses less digits than its factorization.

16642665049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13410779.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 16642665049 in words is "sixteen billion, six hundred forty-two million, six hundred sixty-five thousand, forty-nine".