618911050681 has 81 divisors (see below), whose sum is σ = 842048362701. Its totient is φ = 453144384000.

The previous prime is 618911050627. The next prime is 618911050711. The reversal of 618911050681 is 186050119816.

It is a happy number.

The square root of 618911050681 is 786709.

It is a perfect power (a square), and thus also a powerful number.

618911050681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 238695759225 + 380215291456 = 488565^2 + 616616^2 .

It is not a de Polignac number, because 618911050681 - 2⁹ = 618911050169 is a prime.

It is a super-2 number, since 2×618911050681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (618911050081) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1029801781 + ... + 1029802381.

Almost surely, 2^618911050681 is an apocalyptic number.

618911050681 is the 786709-th square number.

618911050681 is the 393355-th centered octagonal number.

It is an amenable number.

618911050681 is a deficient number, since it is larger than the sum of its proper divisors (223137312020).

618911050681 is an equidigital number, since it uses as much as digits as its factorization.

618911050681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 46.

The spelling of 618911050681 in words is "six hundred eighteen billion, nine hundred eleven million, fifty thousand, six hundred eighty-one".