718448421961 has 4 divisors (see below), whose sum is σ = 718845137424. Its totient is φ = 718051706500.

The previous prime is 718448421949. The next prime is 718448421997. The reversal of 718448421961 is 169124844817.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169124844817 = 449 ⋅376670033.

It is a cyclic number.

It is not a de Polignac number, because 718448421961 - 2²¹ = 718446324809 is a prime.

It is a super-2 number, since 2×718448421961² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718448424961) 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, 198355015 + ... + 198358636.

It is an arithmetic number, because the mean of its divisors is an integer number (179711284356).

Almost surely, 2^718448421961 is an apocalyptic number.

It is an amenable number.

718448421961 is a deficient number, since it is larger than the sum of its proper divisors (396715463).

718448421961 is a wasteful number, since it uses less digits than its factorization.

718448421961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396715462.

The product of its digits is 3096576, while the sum is 55.

The spelling of 718448421961 in words is "seven hundred eighteen billion, four hundred forty-eight million, four hundred twenty-one thousand, nine hundred sixty-one".