612188638048517 has 4 divisors (see below), whose sum is σ = 612237877073100. Its totient is φ = 612139399023936.

The previous prime is 612188638048457. The next prime is 612188638048567. The reversal of 612188638048517 is 715840836881216.

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 139970052839236 + 472218585209281 = 11830894^2 + 21730591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612188638048517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612188638048567) 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, 24619493642 + ... + 24619518507.

It is an arithmetic number, because the mean of its divisors is an integer number (153059469268275).

Almost surely, 2^{612188638048517} is an apocalyptic number.

It is an amenable number.

612188638048517 is a deficient number, since it is larger than the sum of its proper divisors (49239024583).

612188638048517 is a wasteful number, since it uses less digits than its factorization.

612188638048517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49239024582.

The product of its (nonzero) digits is 123863040, while the sum is 68.

The spelling of 612188638048517 in words is "six hundred twelve trillion, one hundred eighty-eight billion, six hundred thirty-eight million, forty-eight thousand, five hundred seventeen".