51612500785 has 4 divisors (see below), whose sum is σ = 61935000948. Its totient is φ = 41290000624.

The previous prime is 51612500777. The next prime is 51612500813. The reversal of 51612500785 is 58700521615.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58700521615 = 5 ⋅11740104323.

It can be written as a sum of positive squares in 2 ways, for example, as 31085921344 + 20526579441 = 176312^2 + 143271^2 .

It is a cyclic number.

It is not a de Polignac number, because 51612500785 - 2³ = 51612500777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5161250074 + ... + 5161250083.

It is an arithmetic number, because the mean of its divisors is an integer number (15483750237).

Almost surely, 2^51612500785 is an apocalyptic number.

It is an amenable number.

51612500785 is a deficient number, since it is larger than the sum of its proper divisors (10322500163).

51612500785 is a wasteful number, since it uses less digits than its factorization.

51612500785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10322500162.

The product of its (nonzero) digits is 84000, while the sum is 40.

The spelling of 51612500785 in words is "fifty-one billion, six hundred twelve million, five hundred thousand, seven hundred eighty-five".