1649200417691 has 2 divisors, whose sum is σ = 1649200417692. Its totient is φ = 1649200417690.

The previous prime is 1649200417603. The next prime is 1649200417729. The reversal of 1649200417691 is 1967140029461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1649200417691 - 2³⁴ = 1632020548507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1649200413691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824600208845 + 824600208846.

It is an arithmetic number, because the mean of its divisors is an integer number (824600208846).

Almost surely, 2^{1649200417691} is an apocalyptic number.

1649200417691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649200417691 is an equidigital number, since it uses as much as digits as its factorization.

1649200417691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 1649200417691 in words is "one trillion, six hundred forty-nine billion, two hundred million, four hundred seventeen thousand, six hundred ninety-one".