649543065 has 8 divisors (see below), whose sum is σ = 1039268928. Its totient is φ = 346422960.

The previous prime is 649543061. The next prime is 649543133. The reversal of 649543065 is 560345946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649543065 - 2² = 649543061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649543061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21651421 + ... + 21651450.

It is an arithmetic number, because the mean of its divisors is an integer number (129908616).

Almost surely, 2^649543065 is an apocalyptic number.

It is an amenable number.

649543065 is a deficient number, since it is larger than the sum of its proper divisors (389725863).

649543065 is a wasteful number, since it uses less digits than its factorization.

649543065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43302879.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 649543065 is about 25486.1347599043. The cubic root of 649543065 is about 866.0360757248.

The spelling of 649543065 in words is "six hundred forty-nine million, five hundred forty-three thousand, sixty-five".