617856381081 has 48 divisors (see below), whose sum is σ = 952626168000. Its totient is φ = 385837100352.

The previous prime is 617856380987. The next prime is 617856381151. The reversal of 617856381081 is 180183658716.

617856381081 is a `hidden beast` number, since 6 + 1 + 78 + 563 + 8 + 1 + 0 + 8 + 1 = 666.

617856381081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 617856381081 - 2¹⁵ = 617856348313 is a prime.

It is a super-2 number, since 2×617856381081² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (617856380081) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5437830 + ... + 5550288.

It is an arithmetic number, because the mean of its divisors is an integer number (19846378500).

Almost surely, 2^617856381081 is an apocalyptic number.

It is an amenable number.

617856381081 is a deficient number, since it is larger than the sum of its proper divisors (334769786919).

617856381081 is a wasteful number, since it uses less digits than its factorization.

617856381081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112611 (or 112570 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 617856381081 in words is "six hundred seventeen billion, eight hundred fifty-six million, three hundred eighty-one thousand, eighty-one".