61312317517 has 4 divisors (see below), whose sum is σ = 66886164576. Its totient is φ = 55738470460.

The previous prime is 61312317511. The next prime is 61312317527. The reversal of 61312317517 is 71571321316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61312317517 - 2¹⁹ = 61311793229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61312317511) 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, 2786923513 + ... + 2786923534.

It is an arithmetic number, because the mean of its divisors is an integer number (16721541144).

Almost surely, 2^61312317517 is an apocalyptic number.

It is an amenable number.

61312317517 is a deficient number, since it is larger than the sum of its proper divisors (5573847059).

61312317517 is a wasteful number, since it uses less digits than its factorization.

61312317517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5573847058.

The product of its digits is 26460, while the sum is 37.

The spelling of 61312317517 in words is "sixty-one billion, three hundred twelve million, three hundred seventeen thousand, five hundred seventeen".