612345622789 has 4 divisors (see below), whose sum is σ = 628895504524. Its totient is φ = 595795741056.

The previous prime is 612345622751. The next prime is 612345622871. The reversal of 612345622789 is 987226543216.

It is a happy number.

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 356731452900 + 255614169889 = 597270^2 + 505583^2 .

It is a cyclic number.

It is not a de Polignac number, because 612345622789 - 2⁹ = 612345622277 is a prime.

It is a super-2 number, since 2×612345622789² (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 (612345602789) 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, 8274940812 + ... + 8274940885.

It is an arithmetic number, because the mean of its divisors is an integer number (157223876131).

Almost surely, 2^612345622789 is an apocalyptic number.

It is an amenable number.

612345622789 is a deficient number, since it is larger than the sum of its proper divisors (16549881735).

612345622789 is a wasteful number, since it uses less digits than its factorization.

612345622789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16549881734.

The product of its digits is 8709120, while the sum is 55.

The spelling of 612345622789 in words is "six hundred twelve billion, three hundred forty-five million, six hundred twenty-two thousand, seven hundred eighty-nine".