618601643541 has 256 divisors, whose sum is σ = 1193744793600. Its totient is φ = 308135632896.

The previous prime is 618601643533. The next prime is 618601643551. The reversal of 618601643541 is 145346106816.

618601643541 is a `hidden beast` number, since 6 + 1 + 8 + 60 + 1 + 6 + 43 + 541 = 666.

It is not a de Polignac number, because 618601643541 - 2³ = 618601643533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618601643501) by changing a digit.

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 255 ways as a sum of consecutive naturals, for example, 565966191 + ... + 565967283.

It is an arithmetic number, because the mean of its divisors is an integer number (4663065600).

Almost surely, 2^618601643541 is an apocalyptic number.

It is an amenable number.

618601643541 is a deficient number, since it is larger than the sum of its proper divisors (575143150059).

618601643541 is a wasteful number, since it uses less digits than its factorization.

618601643541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 618601643541 in words is "six hundred eighteen billion, six hundred one million, six hundred forty-three thousand, five hundred forty-one".