640666203432 has 16 divisors (see below), whose sum is σ = 1601665508640. Its totient is φ = 213555401136.

The previous prime is 640666203427. The next prime is 640666203433. The reversal of 640666203432 is 234302666046.

It is not an unprimeable number, because it can be changed into a prime (640666203433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13347212548 + ... + 13347212595.

It is an arithmetic number, because the mean of its divisors is an integer number (100104094290).

Almost surely, 2^640666203432 is an apocalyptic number.

It is an amenable number.

640666203432 is an abundant number, since it is smaller than the sum of its proper divisors (960999305208).

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

640666203432 is a wasteful number, since it uses less digits than its factorization.

640666203432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26694425152 (or 26694425148 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 42.

Adding to 640666203432 its reverse (234302666046), we get a palindrome (874968869478).

The spelling of 640666203432 in words is "six hundred forty billion, six hundred sixty-six million, two hundred three thousand, four hundred thirty-two".