640215530444234 has 16 divisors (see below), whose sum is σ = 961898124022368. Its totient is φ = 319582831376592.

The previous prime is 640215530444213. The next prime is 640215530444249. The reversal of 640215530444234 is 432444035512046.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145027529 + ... + 149376755.

It is an arithmetic number, because the mean of its divisors is an integer number (60118632751398).

Almost surely, 2^{640215530444234} is an apocalyptic number.

640215530444234 is a deficient number, since it is larger than the sum of its proper divisors (321682593578134).

640215530444234 is a wasteful number, since it uses less digits than its factorization.

640215530444234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469909.

The product of its (nonzero) digits is 5529600, while the sum is 47.

The spelling of 640215530444234 in words is "six hundred forty trillion, two hundred fifteen billion, five hundred thirty million, four hundred forty-four thousand, two hundred thirty-four".