646065957 has 8 divisors (see below), whose sum is σ = 861947776. Its totient is φ = 430447392.

The previous prime is 646065907. The next prime is 646065961. The reversal of 646065957 is 759560646.

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

It is not a de Polignac number, because 646065957 - 2¹⁰ = 646064933 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 (646065907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60013 + ... + 69954.

It is an arithmetic number, because the mean of its divisors is an integer number (107743472).

Almost surely, 2^646065957 is an apocalyptic number.

It is an amenable number.

646065957 is a deficient number, since it is larger than the sum of its proper divisors (215881819).

646065957 is a wasteful number, since it uses less digits than its factorization.

646065957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131627.

The product of its (nonzero) digits is 1360800, while the sum is 48.

The square root of 646065957 is about 25417.8275428881. The cubic root of 646065957 is about 864.4879667579.

The spelling of 646065957 in words is "six hundred forty-six million, sixty-five thousand, nine hundred fifty-seven".