51123727709 has 8 divisors (see below), whose sum is σ = 53816581440. Its totient is φ = 48431087136.

The previous prime is 51123727703. The next prime is 51123727729. The reversal of 51123727709 is 90772732115.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51123727709 is a prime.

It is a super-2 number, since 2×51123727709² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51123727709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51123727703) 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, 748424 + ... + 813870.

It is an arithmetic number, because the mean of its divisors is an integer number (6727072680).

Almost surely, 2^51123727709 is an apocalyptic number.

It is an amenable number.

51123727709 is a deficient number, since it is larger than the sum of its proper divisors (2692853731).

51123727709 is a wasteful number, since it uses less digits than its factorization.

51123727709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106579.

The product of its (nonzero) digits is 185220, while the sum is 44.

The spelling of 51123727709 in words is "fifty-one billion, one hundred twenty-three million, seven hundred twenty-seven thousand, seven hundred nine".