16666851797 has 2 divisors, whose sum is σ = 16666851798. Its totient is φ = 16666851796.

The previous prime is 16666851793. The next prime is 16666851829. The reversal of 16666851797 is 79715866661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16585833796 + 81018001 = 128786^2 + 9001^2 .

It is an emirp because it is prime and its reverse (79715866661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16666851797 - 2² = 16666851793 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16666851793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333425898 + 8333425899.

It is an arithmetic number, because the mean of its divisors is an integer number (8333425899).

Almost surely, 2^16666851797 is an apocalyptic number.

It is an amenable number.

16666851797 is a deficient number, since it is larger than the sum of its proper divisors (1).

16666851797 is an equidigital number, since it uses as much as digits as its factorization.

16666851797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 62.

The spelling of 16666851797 in words is "sixteen billion, six hundred sixty-six million, eight hundred fifty-one thousand, seven hundred ninety-seven".