646040520554 has 64 divisors (see below), whose sum is σ = 1207232957952. Its totient is φ = 254742758400.

The previous prime is 646040520527. The next prime is 646040520581. The reversal of 646040520554 is 455025040646.

It is an interprime number because it is at equal distance from previous prime (646040520527) and next prime (646040520581).

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3193439 + ... + 3389709.

It is an arithmetic number, because the mean of its divisors is an integer number (18863014968).

Almost surely, 2^646040520554 is an apocalyptic number.

646040520554 is a deficient number, since it is larger than the sum of its proper divisors (561192437398).

646040520554 is a wasteful number, since it uses less digits than its factorization.

646040520554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196991.

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 646040520554 in words is "six hundred forty-six billion, forty million, five hundred twenty thousand, five hundred fifty-four".