641151626540 has 24 divisors (see below), whose sum is σ = 1361546716320. Its totient is φ = 253579069568.

The previous prime is 641151626483. The next prime is 641151626567. The reversal of 641151626540 is 45626151146.

It is a super-2 number, since 2×641151626540² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180096992 + ... + 180100551.

It is an arithmetic number, because the mean of its divisors is an integer number (56731113180).

Almost surely, 2^641151626540 is an apocalyptic number.

It is an amenable number.

641151626540 is an abundant number, since it is smaller than the sum of its proper divisors (720395089780).

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

641151626540 is a wasteful number, since it uses less digits than its factorization.

641151626540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360197641 (or 360197639 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

Adding to 641151626540 its reverse (45626151146), we get a palindrome (686777777686).

The spelling of 641151626540 in words is "six hundred forty-one billion, one hundred fifty-one million, six hundred twenty-six thousand, five hundred forty".