617877129109 has 8 divisors (see below), whose sum is σ = 654529021848. Its totient is φ = 581259256320.

The previous prime is 617877129097. The next prime is 617877129169. The reversal of 617877129109 is 901921778716.

It can be written as a sum of positive squares in 4 ways, for example, as 1058526225 + 616818602884 = 32535^2 + 785378^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 617877129109 - 2⁹ = 617877128597 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 (617877129169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8467582 + ... + 8540239.

It is an arithmetic number, because the mean of its divisors is an integer number (81816127731).

Almost surely, 2^617877129109 is an apocalyptic number.

It is an amenable number.

617877129109 is a deficient number, since it is larger than the sum of its proper divisors (36651892739).

617877129109 is a wasteful number, since it uses less digits than its factorization.

617877129109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17009975.

The product of its (nonzero) digits is 2667168, while the sum is 58.

The spelling of 617877129109 in words is "six hundred seventeen billion, eight hundred seventy-seven million, one hundred twenty-nine thousand, one hundred nine".