641474752816 has 20 divisors (see below), whose sum is σ = 1242923101600. Its totient is φ = 320720404032.

The previous prime is 641474752811. The next prime is 641474752817. The reversal of 641474752816 is 618257474146.

It is a happy number.

It is a super-2 number, since 2×641474752816² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641474752811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746136 + ... + 1356343.

It is an arithmetic number, because the mean of its divisors is an integer number (62146155080).

Almost surely, 2^641474752816 is an apocalyptic number.

It is an amenable number.

641474752816 is a deficient number, since it is larger than the sum of its proper divisors (601448348784).

641474752816 is a wasteful number, since it uses less digits than its factorization.

641474752816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121556 (or 2121550 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 55.

The spelling of 641474752816 in words is "six hundred forty-one billion, four hundred seventy-four million, seven hundred fifty-two thousand, eight hundred sixteen".