640652332543506 has 128 divisors (see below), whose sum is σ = 1503027049305600. Its totient is φ = 201871711641600.

The previous prime is 640652332543481. The next prime is 640652332543537. The reversal of 640652332543506 is 605345233256046.

640652332543506 is a `hidden beast` number, since 6 + 4 + 0 + 6 + 5 + 2 + 33 + 254 + 350 + 6 = 666.

It is a super-2 number, since 2×640652332543506² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 80659290 + ... + 88245258.

It is an arithmetic number, because the mean of its divisors is an integer number (11742398822700).

Almost surely, 2^{640652332543506} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640652332543506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751513524652800).

640652332543506 is an abundant number, since it is smaller than the sum of its proper divisors (862374716762094).

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

640652332543506 is a wasteful number, since it uses less digits than its factorization.

640652332543506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7586801 (or 7586795 counting only the distinct ones).

The product of its (nonzero) digits is 46656000, while the sum is 54.

The spelling of 640652332543506 in words is "six hundred forty trillion, six hundred fifty-two billion, three hundred thirty-two million, five hundred forty-three thousand, five hundred six".