51148659787 has 4 divisors (see below), whose sum is σ = 51675965656. Its totient is φ = 50621353920.

The previous prime is 51148659773. The next prime is 51148659803. The reversal of 51148659787 is 78795684115.

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-51148659787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51148659707) 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 3 ways as a sum of consecutive naturals, for example, 263652789 + ... + 263652982.

It is an arithmetic number, because the mean of its divisors is an integer number (12918991414).

Almost surely, 2^51148659787 is an apocalyptic number.

51148659787 is a deficient number, since it is larger than the sum of its proper divisors (527305869).

51148659787 is an equidigital number, since it uses as much as digits as its factorization.

51148659787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527305868.

The product of its digits is 16934400, while the sum is 61.

The spelling of 51148659787 in words is "fifty-one billion, one hundred forty-eight million, six hundred fifty-nine thousand, seven hundred eighty-seven".