51666010614997 has 4 divisors (see below), whose sum is σ = 52437145101856. Its totient is φ = 50894876128140.

The previous prime is 51666010614989. The next prime is 51666010615003. The reversal of 51666010614997 is 79941601066615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51666010614997 - 2³ = 51666010614989 is a prime.

It is a super-2 number, since 2×51666010614997² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51666010614947) 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, 385567243329 + ... + 385567243462.

It is an arithmetic number, because the mean of its divisors is an integer number (13109286275464).

Almost surely, 2^{51666010614997} is an apocalyptic number.

It is an amenable number.

51666010614997 is a deficient number, since it is larger than the sum of its proper divisors (771134486859).

51666010614997 is an equidigital number, since it uses as much as digits as its factorization.

51666010614997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771134486858.

The product of its (nonzero) digits is 14696640, while the sum is 61.

The spelling of 51666010614997 in words is "fifty-one trillion, six hundred sixty-six billion, ten million, six hundred fourteen thousand, nine hundred ninety-seven".