51447667865222 has 4 divisors (see below), whose sum is σ = 77171501797836. Its totient is φ = 25723833932610.

The previous prime is 51447667865207. The next prime is 51447667865239. The reversal of 51447667865222 is 22256876674415.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12861916966304 + ... + 12861916966307.

It is an arithmetic number, because the mean of its divisors is an integer number (19292875449459).

Almost surely, 2^{51447667865222} is an apocalyptic number.

51447667865222 is a deficient number, since it is larger than the sum of its proper divisors (25723833932614).

51447667865222 is a wasteful number, since it uses less digits than its factorization.

51447667865222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25723833932613.

The product of its digits is 270950400, while the sum is 65.

The spelling of 51447667865222 in words is "fifty-one trillion, four hundred forty-seven billion, six hundred sixty-seven million, eight hundred sixty-five thousand, two hundred twenty-two".