16551166601 has 2 divisors, whose sum is σ = 16551166602. Its totient is φ = 16551166600.

The previous prime is 16551166571. The next prime is 16551166603. The reversal of 16551166601 is 10666115561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16160511376 + 390655225 = 127124^2 + 19765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16551166601 is a prime.

It is a super-2 number, since 2×16551166601² (a number of 21 digits) contains 22 as substring.

Together with 16551166603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16551166603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275583300 + 8275583301.

It is an arithmetic number, because the mean of its divisors is an integer number (8275583301).

Almost surely, 2^16551166601 is an apocalyptic number.

It is an amenable number.

16551166601 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551166601 is an equidigital number, since it uses as much as digits as its factorization.

16551166601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 16551166601 in words is "sixteen billion, five hundred fifty-one million, one hundred sixty-six thousand, six hundred one".