16727651561 has 4 divisors (see below), whose sum is σ = 16728562500. Its totient is φ = 16726740624.

The previous prime is 16727651557. The next prime is 16727651569. The reversal of 16727651561 is 16515672761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16515672761 = 7 ⋅2359381823.

It can be written as a sum of positive squares in 2 ways, for example, as 8940648025 + 7787003536 = 94555^2 + 88244^2 .

It is a cyclic number.

It is not a de Polignac number, because 16727651561 - 2² = 16727651557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16727651569) 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 3 ways as a sum of consecutive naturals, for example, 427346 + ... + 464843.

It is an arithmetic number, because the mean of its divisors is an integer number (4182140625).

Almost surely, 2^16727651561 is an apocalyptic number.

It is an amenable number.

16727651561 is a deficient number, since it is larger than the sum of its proper divisors (910939).

16727651561 is an equidigital number, since it uses as much as digits as its factorization.

16727651561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910938.

The product of its digits is 529200, while the sum is 47.

The spelling of 16727651561 in words is "sixteen billion, seven hundred twenty-seven million, six hundred fifty-one thousand, five hundred sixty-one".