617618881 has 4 divisors (see below), whose sum is σ = 673766064. Its totient is φ = 561471700.

The previous prime is 617618863. The next prime is 617618893. The reversal of 617618881 is 188816716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 617618881 - 2⁵ = 617618849 is a prime.

It is a super-2 number, since 2×617618881² = 762906164335384322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (617628881) 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, 28073575 + ... + 28073596.

It is an arithmetic number, because the mean of its divisors is an integer number (168441516).

Almost surely, 2^617618881 is an apocalyptic number.

It is an amenable number.

617618881 is a deficient number, since it is larger than the sum of its proper divisors (56147183).

617618881 is a wasteful number, since it uses less digits than its factorization.

617618881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56147182.

The product of its digits is 129024, while the sum is 46.

The square root of 617618881 is about 24851.9391798709. The cubic root of 617618881 is about 851.6088932249.

The spelling of 617618881 in words is "six hundred seventeen million, six hundred eighteen thousand, eight hundred eighty-one".