2161636767 has 8 divisors (see below), whose sum is σ = 3202424880. Its totient is φ = 1441091160.

The previous prime is 2161636739. The next prime is 2161636781. The reversal of 2161636767 is 7676361612.

2161636767 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 636 + 7 + 6 + 7 = 666.

It is not a de Polignac number, because 2161636767 - 2⁷ = 2161636639 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161636067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40030284 + ... + 40030337.

It is an arithmetic number, because the mean of its divisors is an integer number (400303110).

Almost surely, 2^2161636767 is an apocalyptic number.

2161636767 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2161636767 is a deficient number, since it is larger than the sum of its proper divisors (1040788113).

2161636767 is an equidigital number, since it uses as much as digits as its factorization.

2161636767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80060630 (or 80060624 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 2161636767 is about 46493.4056291857. The cubic root of 2161636767 is about 1292.9872415449.

The spelling of 2161636767 in words is "two billion, one hundred sixty-one million, six hundred thirty-six thousand, seven hundred sixty-seven".