647240637605642 has 32 divisors (see below), whose sum is σ = 993968170728192. Its totient is φ = 315925950138624.

The previous prime is 647240637605579. The next prime is 647240637605701. The reversal of 647240637605642 is 246506736042746.

It is a super-2 number, since 2×647240637605642² (a number of 30 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2913720383 + ... + 2913942509.

It is an arithmetic number, because the mean of its divisors is an integer number (31061505335256).

Almost surely, 2^{647240637605642} is an apocalyptic number.

647240637605642 is a deficient number, since it is larger than the sum of its proper divisors (346727533122550).

647240637605642 is a wasteful number, since it uses less digits than its factorization.

647240637605642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240062.

The product of its (nonzero) digits is 243855360, while the sum is 62.

The spelling of 647240637605642 in words is "six hundred forty-seven trillion, two hundred forty billion, six hundred thirty-seven million, six hundred five thousand, six hundred forty-two".