718606281661 has 4 divisors (see below), whose sum is σ = 718608234112. Its totient is φ = 718604329212.

The previous prime is 718606281649. The next prime is 718606281683. The reversal of 718606281661 is 166182606817.

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 718606281661 - 2¹⁷ = 718606150589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 718606281599 and 718606281608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718606281061) 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, 238125 + ... + 1222258.

It is an arithmetic number, because the mean of its divisors is an integer number (179652058528).

Almost surely, 2^718606281661 is an apocalyptic number.

It is an amenable number.

718606281661 is a deficient number, since it is larger than the sum of its proper divisors (1952451).

718606281661 is a wasteful number, since it uses less digits than its factorization.

718606281661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952450.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 718606281661 in words is "seven hundred eighteen billion, six hundred six million, two hundred eighty-one thousand, six hundred sixty-one".