500991296640 has 128 divisors (see below), whose sum is σ = 1597360392000. Its totient is φ = 133559980032.

The previous prime is 500991296629. The next prime is 500991296669. The reversal of 500991296640 is 46692199005.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7132411 + ... + 7202309.

Almost surely, 2^500991296640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 500991296640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798680196000).

500991296640 is an abundant number, since it is smaller than the sum of its proper divisors (1096369095360).

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

500991296640 is a wasteful number, since it uses less digits than its factorization.

500991296640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73654 (or 73642 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 51.

The spelling of 500991296640 in words is "five hundred billion, nine hundred ninety-one million, two hundred ninety-six thousand, six hundred forty".