617679779231 has 4 divisors (see below), whose sum is σ = 617704981272. Its totient is φ = 617654577192.

The previous prime is 617679779207. The next prime is 617679779267. The reversal of 617679779231 is 132977976716.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 617679779231 - 2¹⁰ = 617679778207 is a prime.

It is a super-2 number, since 2×617679779231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617679779131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12564221 + ... + 12613286.

It is an arithmetic number, because the mean of its divisors is an integer number (154426245318).

Almost surely, 2^617679779231 is an apocalyptic number.

617679779231 is a deficient number, since it is larger than the sum of its proper divisors (25202041).

617679779231 is a wasteful number, since it uses less digits than its factorization.

617679779231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25202040.

The product of its digits is 42007896, while the sum is 65.

The spelling of 617679779231 in words is "six hundred seventeen billion, six hundred seventy-nine million, seven hundred seventy-nine thousand, two hundred thirty-one".