51362113666 has 4 divisors (see below), whose sum is σ = 77043170502. Its totient is φ = 25681056832.

The previous prime is 51362113657. The next prime is 51362113667. The reversal of 51362113666 is 66631126315.

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., 50207813041 + 1154300625 = 224071^2 + 33975^2 .

It is not an unprimeable number, because it can be changed into a prime (51362113667) 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 as a sum of consecutive naturals, namely, 12840528415 + ... + 12840528418.

Almost surely, 2^51362113666 is an apocalyptic number.

51362113666 is a deficient number, since it is larger than the sum of its proper divisors (25681056836).

51362113666 is a wasteful number, since it uses less digits than its factorization.

51362113666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25681056835.

The product of its digits is 116640, while the sum is 40.

The spelling of 51362113666 in words is "fifty-one billion, three hundred sixty-two million, one hundred thirteen thousand, six hundred sixty-six".