78181400448866 has 64 divisors (see below), whose sum is σ = 141423001163136. Its totient is φ = 31939439616000.

The previous prime is 78181400448859. The next prime is 78181400448881. The reversal of 78181400448866 is 66884400418187.

It is a super-2 number, since 2×78181400448866² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6128735 + ... + 13925666.

It is an arithmetic number, because the mean of its divisors is an integer number (2209734393174).

Almost surely, 2^{78181400448866} is an apocalyptic number.

78181400448866 is a deficient number, since it is larger than the sum of its proper divisors (63241600714270).

78181400448866 is a wasteful number, since it uses less digits than its factorization.

78181400448866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20054787.

The product of its (nonzero) digits is 66060288, while the sum is 65.

The spelling of 78181400448866 in words is "seventy-eight trillion, one hundred eighty-one billion, four hundred million, four hundred forty-eight thousand, eight hundred sixty-six".