16580100749 has 4 divisors (see below), whose sum is σ = 16580517564. Its totient is φ = 16579683936.

The previous prime is 16580100743. The next prime is 16580100751. The reversal of 16580100749 is 94700108561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16277166724 + 302934025 = 127582^2 + 17405^2 .

It is a cyclic number.

It is not a de Polignac number, because 16580100749 - 2²⁰ = 16579052173 is a prime.

It is a super-2 number, since 2×16580100749² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16580100743) 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, 141602 + ... + 230675.

It is an arithmetic number, because the mean of its divisors is an integer number (4145129391).

Almost surely, 2^16580100749 is an apocalyptic number.

It is an amenable number.

16580100749 is a deficient number, since it is larger than the sum of its proper divisors (416815).

16580100749 is an equidigital number, since it uses as much as digits as its factorization.

16580100749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416814.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 16580100749 in words is "sixteen billion, five hundred eighty million, one hundred thousand, seven hundred forty-nine".