51549007786 has 4 divisors (see below), whose sum is σ = 77323511682. Its totient is φ = 25774503892.

The previous prime is 51549007771. The next prime is 51549007813. The reversal of 51549007786 is 68770094515.

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., 27425016025 + 24123991761 = 165605^2 + 155319^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12887251945 + ... + 12887251948.

Almost surely, 2^51549007786 is an apocalyptic number.

51549007786 is a deficient number, since it is larger than the sum of its proper divisors (25774503896).

51549007786 is a wasteful number, since it uses less digits than its factorization.

51549007786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25774503895.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 51549007786 in words is "fifty-one billion, five hundred forty-nine million, seven thousand, seven hundred eighty-six".