640243242342046 has 8 divisors (see below), whose sum is σ = 1097559844014960. Its totient is φ = 274389961003728.

The previous prime is 640243242341999. The next prime is 640243242342089.

640243242342046 is nontrivially palindromic in base 10.

640243242342046 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×640243242342046² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640243242341987 and 640243242342005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22865830083631 + ... + 22865830083658.

It is an arithmetic number, because the mean of its divisors is an integer number (137194980501870).

Almost surely, 2^{640243242342046} is an apocalyptic number.

640243242342046 is a deficient number, since it is larger than the sum of its proper divisors (457316601672914).

640243242342046 is a wasteful number, since it uses less digits than its factorization.

640243242342046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45731660167298.

The product of its (nonzero) digits is 5308416, while the sum is 46.

The spelling of 640243242342046 in words is "six hundred forty trillion, two hundred forty-three billion, two hundred forty-two million, three hundred forty-two thousand, forty-six".