640266053520 has 40 divisors (see below), whose sum is σ = 1984824766656. Its totient is φ = 170737614208.

The previous prime is 640266053513. The next prime is 640266053549. The reversal of 640266053520 is 25350662046.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1333887372 + ... + 1333887851.

Almost surely, 2^640266053520 is an apocalyptic number.

640266053520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640266053520 is an abundant number, since it is smaller than the sum of its proper divisors (1344558713136).

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

640266053520 is a wasteful number, since it uses less digits than its factorization.

640266053520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667775239 (or 2667775233 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 640266053520 in words is "six hundred forty billion, two hundred sixty-six million, fifty-three thousand, five hundred twenty".