612123158689 has 21 divisors (see below), whose sum is σ = 714456038451. Its totient is φ = 524446972560.

The previous prime is 612123158687. The next prime is 612123158723. The reversal of 612123158689 is 986851321216.

It is a happy number.

The square root of 612123158689 is 782383.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 368166192289 + 243956966400 = 606767^2 + 493920^2 .

It is not a de Polignac number, because 612123158689 - 2¹ = 612123158687 is a prime.

It is a super-2 number, since 2×612123158689² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612123158687) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 268356229 + ... + 268358509.

Almost surely, 2^612123158689 is an apocalyptic number.

612123158689 is the 782383-rd square number.

612123158689 is the 391192-nd centered octagonal number.

It is an amenable number.

612123158689 is a deficient number, since it is larger than the sum of its proper divisors (102332879762).

612123158689 is an frugal number, since it uses more digits than its factorization.

612123158689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604 (or 2288 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 52.

The spelling of 612123158689 in words is "six hundred twelve billion, one hundred twenty-three million, one hundred fifty-eight thousand, six hundred eighty-nine".