51044773642 has 4 divisors (see below), whose sum is σ = 76567160466. Its totient is φ = 25522386820.

The previous prime is 51044773621. The next prime is 51044773643. The reversal of 51044773642 is 24637744015.

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., 44935944361 + 6108829281 = 211981^2 + 78159^2 .

It is not an unprimeable number, because it can be changed into a prime (51044773643) by changing a digit.

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, 12761193409 + ... + 12761193412.

Almost surely, 2^51044773642 is an apocalyptic number.

51044773642 is a deficient number, since it is larger than the sum of its proper divisors (25522386824).

51044773642 is a wasteful number, since it uses less digits than its factorization.

51044773642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25522386823.

The product of its (nonzero) digits is 564480, while the sum is 43.

The spelling of 51044773642 in words is "fifty-one billion, forty-four million, seven hundred seventy-three thousand, six hundred forty-two".