51250781759 has 4 divisors (see below), whose sum is σ = 51266755920. Its totient is φ = 51234807600.

The previous prime is 51250781749. The next prime is 51250781779. The reversal of 51250781759 is 95718705215.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51250781759 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 (51250781749) 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, 7982267 + ... + 7988684.

It is an arithmetic number, because the mean of its divisors is an integer number (12816688980).

Almost surely, 2^51250781759 is an apocalyptic number.

51250781759 is a deficient number, since it is larger than the sum of its proper divisors (15974161).

51250781759 is a wasteful number, since it uses less digits than its factorization.

51250781759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15974160.

The product of its (nonzero) digits is 882000, while the sum is 50.

The spelling of 51250781759 in words is "fifty-one billion, two hundred fifty million, seven hundred eighty-one thousand, seven hundred fifty-nine".