640106946432 has 48 divisors (see below), whose sum is σ = 1841974419480. Its totient is φ = 213368981760.

The previous prime is 640106946431. The next prime is 640106946449. The reversal of 640106946432 is 234649601046.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640106946431) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 277823044 + ... + 277825347.

Almost surely, 2^640106946432 is an apocalyptic number.

It is an amenable number.

640106946432 is an abundant number, since it is smaller than the sum of its proper divisors (1201867473048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640106946432 is a wasteful number, since it uses less digits than its factorization.

640106946432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555648411 (or 555648396 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The spelling of 640106946432 in words is "six hundred forty billion, one hundred six million, nine hundred forty-six thousand, four hundred thirty-two".