641135056643 has 4 divisors (see below), whose sum is σ = 641136961440. Its totient is φ = 641133151848.

The previous prime is 641135056621. The next prime is 641135056697. The reversal of 641135056643 is 346650531146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346650531146 = 2 ⋅173325265573.

It is a cyclic number.

It is not a de Polignac number, because 641135056643 - 2⁶ = 641135056579 is a prime.

It is a super-2 number, since 2×641135056643² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641135056594 and 641135056603.

It is not an unprimeable number, because it can be changed into a prime (641135056613) 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, 297323 + ... + 1170756.

It is an arithmetic number, because the mean of its divisors is an integer number (160284240360).

Almost surely, 2^641135056643 is an apocalyptic number.

641135056643 is a deficient number, since it is larger than the sum of its proper divisors (1904797).

641135056643 is a wasteful number, since it uses less digits than its factorization.

641135056643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904796.

The product of its (nonzero) digits is 777600, while the sum is 44.

Adding to 641135056643 its reverse (346650531146), we get a palindrome (987785587789).

The spelling of 641135056643 in words is "six hundred forty-one billion, one hundred thirty-five million, fifty-six thousand, six hundred forty-three".