16634642201 has 2 divisors, whose sum is σ = 16634642202. Its totient is φ = 16634642200.

The previous prime is 16634642161. The next prime is 16634642209. The reversal of 16634642201 is 10224643661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16154155801 + 480486400 = 127099^2 + 21920^2 .

It is a cyclic number.

It is not a de Polignac number, because 16634642201 - 2¹⁸ = 16634380057 is a prime.

It is a super-3 number, since 3×16634642201³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (16634642209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8317321100 + 8317321101.

It is an arithmetic number, because the mean of its divisors is an integer number (8317321101).

Almost surely, 2^16634642201 is an apocalyptic number.

It is an amenable number.

16634642201 is a deficient number, since it is larger than the sum of its proper divisors (1).

16634642201 is an equidigital number, since it uses as much as digits as its factorization.

16634642201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 16634642201 in words is "sixteen billion, six hundred thirty-four million, six hundred forty-two thousand, two hundred one".