51747253619 has 4 divisors (see below), whose sum is σ = 51877599744. Its totient is φ = 51616907496.

The previous prime is 51747253609. The next prime is 51747253643. The reversal of 51747253619 is 91635274715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51747253619 - 2⁴ = 51747253603 is a prime.

It is a super-2 number, since 2×51747253619² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51747253609) 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, 65172467 + ... + 65173260.

It is an arithmetic number, because the mean of its divisors is an integer number (12969399936).

Almost surely, 2^51747253619 is an apocalyptic number.

51747253619 is a deficient number, since it is larger than the sum of its proper divisors (130346125).

51747253619 is a wasteful number, since it uses less digits than its factorization.

51747253619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130346124.

The product of its digits is 1587600, while the sum is 50.

The spelling of 51747253619 in words is "fifty-one billion, seven hundred forty-seven million, two hundred fifty-three thousand, six hundred nineteen".