640240042046 has 16 divisors (see below), whose sum is σ = 1051012708848. Its totient is φ = 290088427200.

The previous prime is 640240042037. The next prime is 640240042063.

640240042046 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×640240042046² (a number of 24 digits) contains 22 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 46481645 + ... + 46495416.

It is an arithmetic number, because the mean of its divisors is an integer number (65688294303).

Almost surely, 2^640240042046 is an apocalyptic number.

640240042046 is a deficient number, since it is larger than the sum of its proper divisors (410772666802).

640240042046 is a wasteful number, since it uses less digits than its factorization.

640240042046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92977387.

The product of its (nonzero) digits is 36864, while the sum is 32.

It can be divided in two parts, 6402400 and 42046, that added together give a palindrome (6444446).

The spelling of 640240042046 in words is "six hundred forty billion, two hundred forty million, forty-two thousand, forty-six".