16666461599 has 2 divisors, whose sum is σ = 16666461600. Its totient is φ = 16666461598.

The previous prime is 16666461563. The next prime is 16666461601. The reversal of 16666461599 is 99516466661.

It is a strong prime.

It is an emirp because it is prime and its reverse (99516466661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16666461599 - 2¹² = 16666457503 is a prime.

Together with 16666461601, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16666461509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333230799 + 8333230800.

It is an arithmetic number, because the mean of its divisors is an integer number (8333230800).

Almost surely, 2^16666461599 is an apocalyptic number.

16666461599 is a deficient number, since it is larger than the sum of its proper divisors (1).

16666461599 is an equidigital number, since it uses as much as digits as its factorization.

16666461599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 59.

The spelling of 16666461599 in words is "sixteen billion, six hundred sixty-six million, four hundred sixty-one thousand, five hundred ninety-nine".