640330265520 has 200 divisors, whose sum is σ = 2426140498320. Its totient is φ = 155231562240.

The previous prime is 640330265479. The next prime is 640330265539. The reversal of 640330265520 is 25562033046.

640330265520 is a `hidden beast` number, since 6 + 40 + 3 + 30 + 2 + 65 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4420375 + ... + 4562934.

Almost surely, 2^640330265520 is an apocalyptic number.

640330265520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640330265520 is an abundant number, since it is smaller than the sum of its proper divisors (1785810232800).

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

640330265520 is a wasteful number, since it uses less digits than its factorization.

640330265520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983345 (or 8983330 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 640330265520 its reverse (25562033046), we get a palindrome (665892298566).

The spelling of 640330265520 in words is "six hundred forty billion, three hundred thirty million, two hundred sixty-five thousand, five hundred twenty".