51642492117 has 4 divisors (see below), whose sum is σ = 68856656160. Its totient is φ = 34428328076.

The previous prime is 51642492059. The next prime is 51642492137. The reversal of 51642492117 is 71129424615.

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 51642492117 - 2¹¹ = 51642490069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642492137) 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, 8607082017 + ... + 8607082022.

It is an arithmetic number, because the mean of its divisors is an integer number (17214164040).

Almost surely, 2^51642492117 is an apocalyptic number.

It is an amenable number.

51642492117 is a deficient number, since it is larger than the sum of its proper divisors (17214164043).

51642492117 is a wasteful number, since it uses less digits than its factorization.

51642492117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17214164042.

The product of its digits is 120960, while the sum is 42.

The spelling of 51642492117 in words is "fifty-one billion, six hundred forty-two million, four hundred ninety-two thousand, one hundred seventeen".