721423678385 has 16 divisors (see below), whose sum is σ = 900060768000. Its totient is φ = 554437388736.

The previous prime is 721423678351. The next prime is 721423678411. The reversal of 721423678385 is 583876324127.

It is a cyclic number.

It is not a de Polignac number, because 721423678385 - 2¹² = 721423674289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721423678385.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12471989 + ... + 12529698.

It is an arithmetic number, because the mean of its divisors is an integer number (56253798000).

Almost surely, 2^721423678385 is an apocalyptic number.

It is an amenable number.

721423678385 is a deficient number, since it is larger than the sum of its proper divisors (178637089615).

721423678385 is a wasteful number, since it uses less digits than its factorization.

721423678385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25001920.

The product of its digits is 13547520, while the sum is 56.

The spelling of 721423678385 in words is "seven hundred twenty-one billion, four hundred twenty-three million, six hundred seventy-eight thousand, three hundred eighty-five".