51821167866222 has 16 divisors (see below), whose sum is σ = 103642492655232. Its totient is φ = 17273696468280.

The previous prime is 51821167866191. The next prime is 51821167866277. The reversal of 51821167866222 is 22266876112815.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2003458 + ... + 10375749.

It is an arithmetic number, because the mean of its divisors is an integer number (6477655790952).

Almost surely, 2^{51821167866222} is an apocalyptic number.

51821167866222 is an abundant number, since it is smaller than the sum of its proper divisors (51821324789010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51821167866222 is a wasteful number, since it uses less digits than its factorization.

51821167866222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13076903.

The product of its digits is 7741440, while the sum is 57.

The spelling of 51821167866222 in words is "fifty-one trillion, eight hundred twenty-one billion, one hundred sixty-seven million, eight hundred sixty-six thousand, two hundred twenty-two".