426623660789 has 4 divisors (see below), whose sum is σ = 426899081100. Its totient is φ = 426348240480.

The previous prime is 426623660747. The next prime is 426623660809. The reversal of 426623660789 is 987066326624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 225395158564 + 201228502225 = 474758^2 + 448585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426623660789 is a prime.

It is a super-2 number, since 2×426623660789² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426623660719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137707832 + ... + 137710929.

It is an arithmetic number, because the mean of its divisors is an integer number (106724770275).

Almost surely, 2^426623660789 is an apocalyptic number.

It is an amenable number.

426623660789 is a deficient number, since it is larger than the sum of its proper divisors (275420311).

426623660789 is a wasteful number, since it uses less digits than its factorization.

426623660789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275420310.

The product of its (nonzero) digits is 31352832, while the sum is 59.

The spelling of 426623660789 in words is "four hundred twenty-six billion, six hundred twenty-three million, six hundred sixty thousand, seven hundred eighty-nine".