51665761234 has 4 divisors (see below), whose sum is σ = 77498641854. Its totient is φ = 25832880616.

The previous prime is 51665761211. The next prime is 51665761237. The reversal of 51665761234 is 43216756615.

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., 43975348209 + 7690413025 = 209703^2 + 87695^2 .

It is not an unprimeable number, because it can be changed into a prime (51665761237) 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, 12916440307 + ... + 12916440310.

Almost surely, 2^51665761234 is an apocalyptic number.

51665761234 is a deficient number, since it is larger than the sum of its proper divisors (25832880620).

51665761234 is a wasteful number, since it uses less digits than its factorization.

51665761234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25832880619.

The product of its digits is 907200, while the sum is 46.

The spelling of 51665761234 in words is "fifty-one billion, six hundred sixty-five million, seven hundred sixty-one thousand, two hundred thirty-four".