612623986209 has 33 divisors (see below), whose sum is σ = 919216174099. Its totient is φ = 408289192920.

The previous prime is 612623986181. The next prime is 612623986211. The reversal of 612623986209 is 902689326216.

It is a happy number.

The square root of 612623986209 is 782703.

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

612623986209 is a `hidden beast` number, since 6 + 1 + 2 + 6 + 2 + 3 + 9 + 8 + 620 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 472583377809 + 140040608400 = 687447^2 + 374220^2 .

It is a de Polignac number, because none of the positive numbers 2^k-612623986209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612623982209) by changing a digit.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 190195219 + ... + 190198439.

Almost surely, 2^612623986209 is an apocalyptic number.

612623986209 is the 782703-rd square number.

612623986209 is the 391352-nd centered octagonal number.

It is an amenable number.

612623986209 is a deficient number, since it is larger than the sum of its proper divisors (306592187890).

612623986209 is an frugal number, since it uses more digits than its factorization.

612623986209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6472 (or 3224 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 612623986209 in words is "six hundred twelve billion, six hundred twenty-three million, nine hundred eighty-six thousand, two hundred nine".