51666043570638 has 24 divisors (see below), whose sum is σ = 120202631981352. Its totient is φ = 14761726734384.

The previous prime is 51666043570621. The next prime is 51666043570643. The reversal of 51666043570638 is 83607534066615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87867420745 + ... + 87867421332.

It is an arithmetic number, because the mean of its divisors is an integer number (5008442999223).

Almost surely, 2^{51666043570638} is an apocalyptic number.

51666043570638 is an abundant number, since it is smaller than the sum of its proper divisors (68536588410714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51666043570638 is a wasteful number, since it uses less digits than its factorization.

51666043570638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175734842096 (or 175734842089 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 60.

The spelling of 51666043570638 in words is "fifty-one trillion, six hundred sixty-six billion, forty-three million, five hundred seventy thousand, six hundred thirty-eight".