2172643567 has 2 divisors, whose sum is σ = 2172643568. Its totient is φ = 2172643566.

The previous prime is 2172643513. The next prime is 2172643637. The reversal of 2172643567 is 7653462712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2172643567 - 2⁷ = 2172643439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172643507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086321783 + 1086321784.

It is an arithmetic number, because the mean of its divisors is an integer number (1086321784).

Almost surely, 2^2172643567 is an apocalyptic number.

2172643567 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172643567 is an equidigital number, since it uses as much as digits as its factorization.

2172643567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 43.

The square root of 2172643567 is about 46611.6248054066. The cubic root of 2172643567 is about 1295.1781068170.

The spelling of 2172643567 in words is "two billion, one hundred seventy-two million, six hundred forty-three thousand, five hundred sixty-seven".