51666329047 has 4 divisors (see below), whose sum is σ = 52926483456. Its totient is φ = 50406174640.

The previous prime is 51666329021. The next prime is 51666329053. The reversal of 51666329047 is 74092366615.

It is a happy number.

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 51666329047 - 2¹⁹ = 51665804759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51666329017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630077143 + ... + 630077224.

It is an arithmetic number, because the mean of its divisors is an integer number (13231620864).

Almost surely, 2^51666329047 is an apocalyptic number.

51666329047 is a deficient number, since it is larger than the sum of its proper divisors (1260154409).

51666329047 is a wasteful number, since it uses less digits than its factorization.

51666329047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260154408.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 51666329047 in words is "fifty-one billion, six hundred sixty-six million, three hundred twenty-nine thousand, forty-seven".