640105026148 has 36 divisors (see below), whose sum is σ = 1292287097920. Its totient is φ = 271766750832.

The previous prime is 640105026139. The next prime is 640105026149. The reversal of 640105026148 is 841620501046.

It is not an unprimeable number, because it can be changed into a prime (640105026149) 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 11 ways as a sum of consecutive naturals, for example, 677808 + ... + 1318951.

Almost surely, 2^640105026148 is an apocalyptic number.

It is an amenable number.

640105026148 is an abundant number, since it is smaller than the sum of its proper divisors (652182071772).

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

640105026148 is a wasteful number, since it uses less digits than its factorization.

640105026148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996984 (or 1996875 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 640105026148 in words is "six hundred forty billion, one hundred five million, twenty-six thousand, one hundred forty-eight".