640511335742 has 4 divisors (see below), whose sum is σ = 960767003616. Its totient is φ = 320255667870.

The previous prime is 640511335661. The next prime is 640511335769. The reversal of 640511335742 is 247533115046.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 640511335742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160127833934 + ... + 160127833937.

It is an arithmetic number, because the mean of its divisors is an integer number (240191750904).

Almost surely, 2^640511335742 is an apocalyptic number.

640511335742 is a deficient number, since it is larger than the sum of its proper divisors (320255667874).

640511335742 is a wasteful number, since it uses less digits than its factorization.

640511335742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320255667873.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 640511335742 in words is "six hundred forty billion, five hundred eleven million, three hundred thirty-five thousand, seven hundred forty-two".