649814444693 has 6 divisors (see below), whose sum is σ = 685815245334. Its totient is φ = 615613684104.

The previous prime is 649814444663. The next prime is 649814444743. The reversal of 649814444693 is 396444418946.

It can be written as a sum of positive squares in only one way, i.e., 633835715044 + 15978729649 = 796138^2 + 126407^2 .

It is not a de Polignac number, because 649814444693 - 2¹⁴ = 649814428309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649814444623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 900019646 + ... + 900020367.

It is an arithmetic number, because the mean of its divisors is an integer number (114302540889).

Almost surely, 2^649814444693 is an apocalyptic number.

It is an amenable number.

649814444693 is a deficient number, since it is larger than the sum of its proper divisors (36000800641).

649814444693 is a wasteful number, since it uses less digits than its factorization.

649814444693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800040051 (or 1800040032 counting only the distinct ones).

The product of its digits is 71663616, while the sum is 62.

The spelling of 649814444693 in words is "six hundred forty-nine billion, eight hundred fourteen million, four hundred forty-four thousand, six hundred ninety-three".