721669888753 has 4 divisors (see below), whose sum is σ = 787276242288. Its totient is φ = 656063535220.

The previous prime is 721669888729. The next prime is 721669888769. The reversal of 721669888753 is 357888966127.

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 721669888753 - 2¹⁷ = 721669757681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721669888253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32803176751 + ... + 32803176772.

It is an arithmetic number, because the mean of its divisors is an integer number (196819060572).

Almost surely, 2^721669888753 is an apocalyptic number.

It is an amenable number.

721669888753 is a deficient number, since it is larger than the sum of its proper divisors (65606353535).

721669888753 is a wasteful number, since it uses less digits than its factorization.

721669888753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65606353534.

The product of its digits is 243855360, while the sum is 70.

The spelling of 721669888753 in words is "seven hundred twenty-one billion, six hundred sixty-nine million, eight hundred eighty-eight thousand, seven hundred fifty-three".