2166742236 has 12 divisors (see below), whose sum is σ = 5055731912. Its totient is φ = 722247408.

The previous prime is 2166742231. The next prime is 2166742261. The reversal of 2166742236 is 6322476612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 2166742194 and 2166742203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166742231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90280915 + ... + 90280938.

Almost surely, 2^2166742236 is an apocalyptic number.

It is an amenable number.

2166742236 is an abundant number, since it is smaller than the sum of its proper divisors (2888989676).

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

2166742236 is a wasteful number, since it uses less digits than its factorization.

2166742236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180561860 (or 180561858 counting only the distinct ones).

The product of its digits is 145152, while the sum is 39.

The square root of 2166742236 is about 46548.2785503395. The cubic root of 2166742236 is about 1294.0043899210.

It can be divided in two parts, 21667 and 42236, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 2166742236 in words is "two billion, one hundred sixty-six million, seven hundred forty-two thousand, two hundred thirty-six".