1649966653 has 4 divisors (see below), whose sum is σ = 1650362688. Its totient is φ = 1649570620.

The previous prime is 1649966597. The next prime is 1649966701. The reversal of 1649966653 is 3566699461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3566699461 = 13 ⋅274361497.

It is a cyclic number.

It is not a de Polignac number, because 1649966653 - 2²¹ = 1647869501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1649966594 and 1649966603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649966453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191701 + ... + 200122.

It is an arithmetic number, because the mean of its divisors is an integer number (412590672).

Almost surely, 2^1649966653 is an apocalyptic number.

It is an amenable number.

1649966653 is a deficient number, since it is larger than the sum of its proper divisors (396035).

1649966653 is an equidigital number, since it uses as much as digits as its factorization.

1649966653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396034.

The product of its digits is 6298560, while the sum is 55.

The square root of 1649966653 is about 40619.7815479109. The cubic root of 1649966653 is about 1181.6577898062.

The spelling of 1649966653 in words is "one billion, six hundred forty-nine million, nine hundred sixty-six thousand, six hundred fifty-three".