641521828624 has 10 divisors (see below), whose sum is σ = 1242948542990. Its totient is φ = 320760914304.

The previous prime is 641521828621. The next prime is 641521828631. The reversal of 641521828624 is 426828125146.

It can be written as a sum of positive squares in only one way, i.e., 510138777600 + 131383051024 = 714240^2 + 362468^2 .

It is not an unprimeable number, because it can be changed into a prime (641521828621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20047557129 + ... + 20047557160.

It is an arithmetic number, because the mean of its divisors is an integer number (124294854299).

Almost surely, 2^641521828624 is an apocalyptic number.

It is an amenable number.

641521828624 is a deficient number, since it is larger than the sum of its proper divisors (601426714366).

641521828624 is a wasteful number, since it uses less digits than its factorization.

641521828624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40095114297 (or 40095114291 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 49.

The spelling of 641521828624 in words is "six hundred forty-one billion, five hundred twenty-one million, eight hundred twenty-eight thousand, six hundred twenty-four".