617340006781 has 4 divisors (see below), whose sum is σ = 624777838272. Its totient is φ = 609902175292.

The previous prime is 617340006779. The next prime is 617340006883. The reversal of 617340006781 is 187600043716.

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 617340006781 - 2¹ = 617340006779 is a prime.

It is a super-2 number, since 2×617340006781² (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 (617340006721) 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, 3718915621 + ... + 3718915786.

It is an arithmetic number, because the mean of its divisors is an integer number (156194459568).

Almost surely, 2^617340006781 is an apocalyptic number.

It is an amenable number.

617340006781 is a deficient number, since it is larger than the sum of its proper divisors (7437831491).

617340006781 is an equidigital number, since it uses as much as digits as its factorization.

617340006781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7437831490.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 617340006781 in words is "six hundred seventeen billion, three hundred forty million, six thousand, seven hundred eighty-one".