51249845858 has 4 divisors (see below), whose sum is σ = 76874768790. Its totient is φ = 25624922928.

The previous prime is 51249845851. The next prime is 51249845861. The reversal of 51249845858 is 85854894215.

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

It can be written as a sum of positive squares in only one way, i.e., 29978498449 + 21271347409 = 173143^2 + 145847^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51249845797 and 51249845806.

It is not an unprimeable number, because it can be changed into a prime (51249845851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12812461463 + ... + 12812461466.

Almost surely, 2^51249845858 is an apocalyptic number.

51249845858 is a deficient number, since it is larger than the sum of its proper divisors (25624922932).

51249845858 is a wasteful number, since it uses less digits than its factorization.

51249845858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25624922931.

The product of its digits is 18432000, while the sum is 59.

The spelling of 51249845858 in words is "fifty-one billion, two hundred forty-nine million, eight hundred forty-five thousand, eight hundred fifty-eight".