641552616 has 256 divisors, whose sum is σ = 1982016000. Its totient is φ = 191600640.

The previous prime is 641552609. The next prime is 641552617. The reversal of 641552616 is 616255146.

641552616 is a `hidden beast` number, since 6 + 41 + 552 + 61 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (641552617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8788356 + ... + 8788428.

It is an arithmetic number, because the mean of its divisors is an integer number (7742250).

Almost surely, 2^641552616 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 641552616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991008000).

641552616 is an abundant number, since it is smaller than the sum of its proper divisors (1340463384).

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

641552616 is a wasteful number, since it uses less digits than its factorization.

641552616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 191 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 641552616 is about 25328.8889610263. Note that the first 3 decimals coincide. The cubic root of 641552616 is about 862.4701902741.

The spelling of 641552616 in words is "six hundred forty-one million, five hundred fifty-two thousand, six hundred sixteen".