2161262567 has 4 divisors (see below), whose sum is σ = 2202041160. Its totient is φ = 2120483976.

The previous prime is 2161262549. The next prime is 2161262569. The reversal of 2161262567 is 7652621612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161262567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161262567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161262569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20389217 + ... + 20389322.

It is an arithmetic number, because the mean of its divisors is an integer number (550510290).

Almost surely, 2^2161262567 is an apocalyptic number.

2161262567 is a deficient number, since it is larger than the sum of its proper divisors (40778593).

2161262567 is an equidigital number, since it uses as much as digits as its factorization.

2161262567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40778592.

The product of its digits is 60480, while the sum is 38.

The square root of 2161262567 is about 46489.3812284053. The cubic root of 2161262567 is about 1292.9126277530.

The spelling of 2161262567 in words is "two billion, one hundred sixty-one million, two hundred sixty-two thousand, five hundred sixty-seven".