1699874610821 has 2 divisors, whose sum is σ = 1699874610822. Its totient is φ = 1699874610820.

The previous prime is 1699874610803. The next prime is 1699874610977. The reversal of 1699874610821 is 1280164789961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1684427601025 + 15447009796 = 1297855^2 + 124286^2 .

It is an emirp because it is prime and its reverse (1280164789961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1699874610821 - 2¹⁴ = 1699874594437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1699874610121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 849937305410 + 849937305411.

It is an arithmetic number, because the mean of its divisors is an integer number (849937305411).

Almost surely, 2^{1699874610821} is an apocalyptic number.

It is an amenable number.

1699874610821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1699874610821 is an equidigital number, since it uses as much as digits as its factorization.

1699874610821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The spelling of 1699874610821 in words is "one trillion, six hundred ninety-nine billion, eight hundred seventy-four million, six hundred ten thousand, eight hundred twenty-one".