51666000543441 has 56 divisors (see below), whose sum is σ = 79177248074880. Its totient is φ = 33690164560416.

The previous prime is 51666000543427. The next prime is 51666000543457. The reversal of 51666000543441 is 14434500066615.

It is not a de Polignac number, because 51666000543441 - 2¹⁵ = 51666000510673 is a prime.

It is a super-2 number, since 2×51666000543441² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51666000543461) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1970091 + ... + 10354383.

Almost surely, 2^{51666000543441} is an apocalyptic number.

It is an amenable number.

51666000543441 is a deficient number, since it is larger than the sum of its proper divisors (27511247531439).

51666000543441 is an equidigital number, since it uses as much as digits as its factorization.

51666000543441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8384497 (or 8384482 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 51666000543441 in words is "fifty-one trillion, six hundred sixty-six billion, five hundred forty-three thousand, four hundred forty-one".