718312921493 has 4 divisors (see below), whose sum is σ = 722614196640. Its totient is φ = 714011646348.

The previous prime is 718312921451. The next prime is 718312921511. The reversal of 718312921493 is 394129213817.

It is a happy number.

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 718312921493 - 2⁶ = 718312921429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718312921793) 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, 2150637323 + ... + 2150637656.

It is an arithmetic number, because the mean of its divisors is an integer number (180653549160).

Almost surely, 2^718312921493 is an apocalyptic number.

It is an amenable number.

718312921493 is a deficient number, since it is larger than the sum of its proper divisors (4301275147).

718312921493 is a wasteful number, since it uses less digits than its factorization.

718312921493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4301275146.

The product of its digits is 653184, while the sum is 50.

The spelling of 718312921493 in words is "seven hundred eighteen billion, three hundred twelve million, nine hundred twenty-one thousand, four hundred ninety-three".