51666010615091 has 4 divisors (see below), whose sum is σ = 51804525389232. Its totient is φ = 51527495840952.

The previous prime is 51666010615031. The next prime is 51666010615127. The reversal of 51666010615091 is 19051601066615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51666010615091 - 2³⁰ = 51664936873267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51666010615031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69257386511 + ... + 69257387256.

It is an arithmetic number, because the mean of its divisors is an integer number (12951131347308).

Almost surely, 2^{51666010615091} is an apocalyptic number.

51666010615091 is a deficient number, since it is larger than the sum of its proper divisors (138514774141).

51666010615091 is a wasteful number, since it uses less digits than its factorization.

51666010615091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138514774140.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 51666010615091 in words is "fifty-one trillion, six hundred sixty-six billion, ten million, six hundred fifteen thousand, ninety-one".