641152633540 has 12 divisors (see below), whose sum is σ = 1346420530476. Its totient is φ = 256461053408.

The previous prime is 641152633423. The next prime is 641152633657. The reversal of 641152633540 is 45336251146.

It is an interprime number because it is at equal distance from previous prime (641152633423) and next prime (641152633657).

It can be written as a sum of positive squares in 2 ways, for example, as 322860331264 + 318292302276 = 568208^2 + 564174^2 .

It is a super-2 number, since 2×641152633540² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641152633493 and 641152633502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16028815819 + ... + 16028815858.

It is an arithmetic number, because the mean of its divisors is an integer number (112201710873).

Almost surely, 2^641152633540 is an apocalyptic number.

It is an amenable number.

641152633540 is an abundant number, since it is smaller than the sum of its proper divisors (705267896936).

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

641152633540 is a wasteful number, since it uses less digits than its factorization.

641152633540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32057631686 (or 32057631684 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 641152633540 its reverse (45336251146), we get a palindrome (686488884686).

The spelling of 641152633540 in words is "six hundred forty-one billion, one hundred fifty-two million, six hundred thirty-three thousand, five hundred forty".