1220187816867 has 16 divisors (see below), whose sum is σ = 1664491755168. Its totient is φ = 794798584320.

The previous prime is 1220187816857. The next prime is 1220187816893. The reversal of 1220187816867 is 7686187810221.

It is not a de Polignac number, because 1220187816867 - 2⁶ = 1220187816803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220187816857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15883128 + ... + 15959765.

It is an arithmetic number, because the mean of its divisors is an integer number (104030734698).

Almost surely, 2^{1220187816867} is an apocalyptic number.

1220187816867 is a deficient number, since it is larger than the sum of its proper divisors (444303938301).

1220187816867 is a wasteful number, since it uses less digits than its factorization.

1220187816867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31843190.

The product of its (nonzero) digits is 3612672, while the sum is 57.

The spelling of 1220187816867 in words is "one trillion, two hundred twenty billion, one hundred eighty-seven million, eight hundred sixteen thousand, eight hundred sixty-seven".