78221166334 has 16 divisors (see below), whose sum is σ = 119222550720. Its totient is φ = 38483696160.

The previous prime is 78221166307. The next prime is 78221166341. The reversal of 78221166334 is 43366112287.

It is a super-2 number, since 2×78221166334² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798537 + ... + 891124.

It is an arithmetic number, because the mean of its divisors is an integer number (7451409420).

Almost surely, 2^78221166334 is an apocalyptic number.

78221166334 is a deficient number, since it is larger than the sum of its proper divisors (41001384386).

78221166334 is a wasteful number, since it uses less digits than its factorization.

78221166334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690035.

The product of its digits is 290304, while the sum is 43.

The spelling of 78221166334 in words is "seventy-eight billion, two hundred twenty-one million, one hundred sixty-six thousand, three hundred thirty-four".