646481669 has 4 divisors (see below), whose sum is σ = 680507040. Its totient is φ = 612456300.

The previous prime is 646481653. The next prime is 646481681. The reversal of 646481669 is 966184646.

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.

It is a cyclic number.

It is not a de Polignac number, because 646481669 - 2⁴ = 646481653 is a prime.

It is a super-2 number, since 2×646481669² = 835877096706051122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646481629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17012657 + ... + 17012694.

It is an arithmetic number, because the mean of its divisors is an integer number (170126760).

Almost surely, 2^646481669 is an apocalyptic number.

It is an amenable number.

646481669 is a deficient number, since it is larger than the sum of its proper divisors (34025371).

646481669 is a wasteful number, since it uses less digits than its factorization.

646481669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34025370.

The product of its digits is 1492992, while the sum is 50.

The square root of 646481669 is about 25426.0037953273. The cubic root of 646481669 is about 864.6733456471.

The spelling of 646481669 in words is "six hundred forty-six million, four hundred eighty-one thousand, six hundred sixty-nine".