640547068512 has 384 divisors, whose sum is σ = 1940844810240. Its totient is φ = 183425679360.

The previous prime is 640547068459. The next prime is 640547068529. The reversal of 640547068512 is 215860745046.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 846164838 + ... + 846165594.

It is an arithmetic number, because the mean of its divisors is an integer number (5054283360).

Almost surely, 2^640547068512 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 640547068512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970422405120).

640547068512 is an abundant number, since it is smaller than the sum of its proper divisors (1300297741728).

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

640547068512 is a wasteful number, since it uses less digits than its factorization.

640547068512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 640547068512 in words is "six hundred forty billion, five hundred forty-seven million, sixty-eight thousand, five hundred twelve".