641152633491 has 80 divisors (see below), whose sum is σ = 974182809600. Its totient is φ = 420193593792.

The previous prime is 641152633423. The next prime is 641152633657. The reversal of 641152633491 is 194336251146.

641152633491 is a `hidden beast` number, since 6 + 4 + 1 + 1 + 5 + 2 + 633 + 4 + 9 + 1 = 666.

641152633491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641152633491 - 2¹¹ = 641152631443 is a prime.

It is a super-3 number, since 3×641152633491³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (641154633491) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 617085750 + ... + 617086788.

It is an arithmetic number, because the mean of its divisors is an integer number (12177285120).

Almost surely, 2^641152633491 is an apocalyptic number.

641152633491 is a deficient number, since it is larger than the sum of its proper divisors (333030176109).

641152633491 is a wasteful number, since it uses less digits than its factorization.

641152633491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670 (or 1661 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 641152633491 in words is "six hundred forty-one billion, one hundred fifty-two million, six hundred thirty-three thousand, four hundred ninety-one".