2166720367 has 8 divisors (see below), whose sum is σ = 2526788000. Its totient is φ = 1857188592.

The previous prime is 2166720337. The next prime is 2166720383. The reversal of 2166720367 is 7630276612.

It is not a de Polignac number, because 2166720367 - 2¹¹ = 2166718319 is a prime.

It is a super-2 number, since 2×2166720367² = 9389354297545229378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166720337) 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, 3158142 + ... + 3158827.

It is an arithmetic number, because the mean of its divisors is an integer number (315848500).

Almost surely, 2^2166720367 is an apocalyptic number.

2166720367 is a deficient number, since it is larger than the sum of its proper divisors (360067633).

2166720367 is an frugal number, since it uses more digits than its factorization.

2166720367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316990 (or 6316976 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 2166720367 is about 46548.0436431006. The cubic root of 2166720367 is about 1294.0000364302. Note that the first 4 decimals are identical.

Adding to 2166720367 its reverse (7630276612), we get a palindrome (9796996979).

The spelling of 2166720367 in words is "two billion, one hundred sixty-six million, seven hundred twenty thousand, three hundred sixty-seven".