640401664046 has 8 divisors (see below), whose sum is σ = 960794670000. Its totient is φ = 320136774048.

The previous prime is 640401664033. The next prime is 640401664081. The reversal of 640401664046 is 640466104046.

640401664046 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 2×640401664046² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640401663994 and 640401664012.

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, 32016491 + ... + 32036486.

It is an arithmetic number, because the mean of its divisors is an integer number (120099333750).

Almost surely, 2^640401664046 is an apocalyptic number.

640401664046 is a deficient number, since it is larger than the sum of its proper divisors (320393005954).

640401664046 is a wasteful number, since it uses less digits than its factorization.

640401664046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64057978.

The product of its (nonzero) digits is 331776, while the sum is 41.

The spelling of 640401664046 in words is "six hundred forty billion, four hundred one million, six hundred sixty-four thousand, forty-six".