16699570645601 has 2 divisors, whose sum is σ = 16699570645602. Its totient is φ = 16699570645600.

The previous prime is 16699570645577. The next prime is 16699570645603. The reversal of 16699570645601 is 10654607599661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14384535363025 + 2315035282576 = 3792695^2 + 1521524^2 .

It is a cyclic number.

It is not a de Polignac number, because 16699570645601 - 2²² = 16699566451297 is a prime.

Together with 16699570645603, 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 (16699570645603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8349785322800 + 8349785322801.

It is an arithmetic number, because the mean of its divisors is an integer number (8349785322801).

Almost surely, 2^{16699570645601} is an apocalyptic number.

It is an amenable number.

16699570645601 is a deficient number, since it is larger than the sum of its proper divisors (1).

16699570645601 is an equidigital number, since it uses as much as digits as its factorization.

16699570645601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73483200, while the sum is 65.

The spelling of 16699570645601 in words is "sixteen trillion, six hundred ninety-nine billion, five hundred seventy million, six hundred forty-five thousand, six hundred one".