51666010615057 has 4 divisors (see below), whose sum is σ = 53447597188020. Its totient is φ = 49884424042096.

The previous prime is 51666010615031. The next prime is 51666010615127. The reversal of 51666010615057 is 75051601066615.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22548860062096 + 29117150552961 = 4748564^2 + 5396031^2 .

It is a cyclic number.

It is not a de Polignac number, because 51666010615057 - 2¹⁵ = 51666010582289 is a prime.

It is a super-2 number, since 2×51666010615057² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51666010615057.

It is not an unprimeable number, because it can be changed into a prime (51666010619057) 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, 890793286438 + ... + 890793286495.

It is an arithmetic number, because the mean of its divisors is an integer number (13361899297005).

Almost surely, 2^{51666010615057} is an apocalyptic number.

It is an amenable number.

51666010615057 is a deficient number, since it is larger than the sum of its proper divisors (1781586572963).

51666010615057 is a wasteful number, since it uses less digits than its factorization.

51666010615057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781586572962.

The product of its (nonzero) digits is 1134000, while the sum is 49.

The spelling of 51666010615057 in words is "fifty-one trillion, six hundred sixty-six billion, ten million, six hundred fifteen thousand, fifty-seven".