51566778167 has 8 divisors (see below), whose sum is σ = 53232922752. Its totient is φ = 49900802400.

The previous prime is 51566778149. The next prime is 51566778191. The reversal of 51566778167 is 76187766515.

51566778167 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51566778167 - 2⁶ = 51566778103 is a prime.

It is a super-2 number, since 2×51566778167² (a number of 22 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 (51566775167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 946817 + ... + 999797.

It is an arithmetic number, because the mean of its divisors is an integer number (6654115344).

Almost surely, 2^51566778167 is an apocalyptic number.

51566778167 is a deficient number, since it is larger than the sum of its proper divisors (1666144585).

51566778167 is a wasteful number, since it uses less digits than its factorization.

51566778167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84409.

The product of its digits is 14817600, while the sum is 59.

The spelling of 51566778167 in words is "fifty-one billion, five hundred sixty-six million, seven hundred seventy-eight thousand, one hundred sixty-seven".