1213007771166 has 16 divisors (see below), whose sum is σ = 2426056988688. Its totient is φ = 404329016000.

The previous prime is 1213007771093. The next prime is 1213007771167. The reversal of 1213007771166 is 6611777003121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213007771167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1339785 + ... + 2054516.

It is an arithmetic number, because the mean of its divisors is an integer number (151628561793).

Almost surely, 2^{1213007771166} is an apocalyptic number.

1213007771166 is an abundant number, since it is smaller than the sum of its proper divisors (1213049217522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213007771166 is a wasteful number, since it uses less digits than its factorization.

1213007771166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3453867.

The product of its (nonzero) digits is 74088, while the sum is 42.

The spelling of 1213007771166 in words is "one trillion, two hundred thirteen billion, seven million, seven hundred seventy-one thousand, one hundred sixty-six".