78222515247766 has 4 divisors (see below), whose sum is σ = 117333772871652. Its totient is φ = 39111257623882.

The previous prime is 78222515247683. The next prime is 78222515247823. The reversal of 78222515247766 is 66774251522287.

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

It is a super-2 number, since 2×78222515247766² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78222515247698 and 78222515247707.

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, 19555628811940 + ... + 19555628811943.

It is an arithmetic number, because the mean of its divisors is an integer number (29333443217913).

Almost surely, 2^{78222515247766} is an apocalyptic number.

78222515247766 is a deficient number, since it is larger than the sum of its proper divisors (39111257623886).

78222515247766 is a wasteful number, since it uses less digits than its factorization.

78222515247766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39111257623885.

The product of its digits is 158054400, while the sum is 64.

The spelling of 78222515247766 in words is "seventy-eight trillion, two hundred twenty-two billion, five hundred fifteen million, two hundred forty-seven thousand, seven hundred sixty-six".