51012257785 has 8 divisors (see below), whose sum is σ = 61776312840. Its totient is φ = 40435403904.

The previous prime is 51012257783. The next prime is 51012257797. The reversal of 51012257785 is 58775221015.

It can be written as a sum of positive squares in 4 ways, for example, as 3238975744 + 47773282041 = 56912^2 + 218571^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51012257785 - 2¹ = 51012257783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51012257783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46799692 + ... + 46800781.

It is an arithmetic number, because the mean of its divisors is an integer number (7722039105).

Almost surely, 2^51012257785 is an apocalyptic number.

It is an amenable number.

51012257785 is a deficient number, since it is larger than the sum of its proper divisors (10764055055).

51012257785 is a wasteful number, since it uses less digits than its factorization.

51012257785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93600587.

The product of its (nonzero) digits is 196000, while the sum is 43.

The spelling of 51012257785 in words is "fifty-one billion, twelve million, two hundred fifty-seven thousand, seven hundred eighty-five".