640354034042 has 8 divisors (see below), whose sum is σ = 974059657632. Its totient is φ = 315667481500.

The previous prime is 640354034011. The next prime is 640354034057. The reversal of 640354034042 is 240430453046.

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

It is a junction number, because it is equal to n+sod(n) for n = 640354033993 and 640354034011.

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, 2254767584 + ... + 2254767867.

It is an arithmetic number, because the mean of its divisors is an integer number (121757457204).

Almost surely, 2^640354034042 is an apocalyptic number.

640354034042 is a deficient number, since it is larger than the sum of its proper divisors (333705623590).

640354034042 is a wasteful number, since it uses less digits than its factorization.

640354034042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4509535524.

The product of its (nonzero) digits is 138240, while the sum is 35.

Adding to 640354034042 its reverse (240430453046), we get a palindrome (880784487088).

The spelling of 640354034042 in words is "six hundred forty billion, three hundred fifty-four million, thirty-four thousand, forty-two".