646550096578 has 16 divisors (see below), whose sum is σ = 988432175160. Its totient is φ = 317076512896.

The previous prime is 646550096573. The next prime is 646550096579. The reversal of 646550096578 is 875690055646.

It can be written as a sum of positive squares in 4 ways, for example, as 493580717809 + 152969378769 = 702553^2 + 391113^2 .

It is a super-2 number, since 2×646550096578² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646550096573) 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 7 ways as a sum of consecutive naturals, for example, 610225 + ... + 1290532.

Almost surely, 2^646550096578 is an apocalyptic number.

646550096578 is a deficient number, since it is larger than the sum of its proper divisors (341882078582).

646550096578 is a wasteful number, since it uses less digits than its factorization.

646550096578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904021.

The product of its (nonzero) digits is 54432000, while the sum is 61.

The spelling of 646550096578 in words is "six hundred forty-six billion, five hundred fifty million, ninety-six thousand, five hundred seventy-eight".