720783021313 has 4 divisors (see below), whose sum is σ = 752121413568. Its totient is φ = 689444629060.

The previous prime is 720783021223. The next prime is 720783021341. The reversal of 720783021313 is 313120387027.

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 720783021313 - 2⁹ = 720783020801 is a prime.

It is a super-2 number, since 2×720783021313² (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 (720783021613) 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, 15669196093 + ... + 15669196138.

It is an arithmetic number, because the mean of its divisors is an integer number (188030353392).

Almost surely, 2^720783021313 is an apocalyptic number.

It is an amenable number.

720783021313 is a deficient number, since it is larger than the sum of its proper divisors (31338392255).

720783021313 is a wasteful number, since it uses less digits than its factorization.

720783021313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31338392254.

The product of its (nonzero) digits is 42336, while the sum is 37.

The spelling of 720783021313 in words is "seven hundred twenty billion, seven hundred eighty-three million, twenty-one thousand, three hundred thirteen".