211656164 has 12 divisors (see below), whose sum is σ = 371204988. Its totient is φ = 105597600.

The previous prime is 211656163. The next prime is 211656167. The reversal of 211656164 is 461656112.

It can be written as a sum of positive squares in 2 ways, for example, as 21436900 + 190219264 = 4630^2 + 13792^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211656164.

It is not an unprimeable number, because it can be changed into a prime (211656161) 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, 55547 + ... + 59234.

It is an arithmetic number, because the mean of its divisors is an integer number (30933749).

Almost surely, 2^211656164 is an apocalyptic number.

It is an amenable number.

211656164 is a deficient number, since it is larger than the sum of its proper divisors (159548824).

211656164 is a wasteful number, since it uses less digits than its factorization.

211656164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115246 (or 115244 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 211656164 is about 14548.4076104569. The cubic root of 211656164 is about 595.9506625525.

The spelling of 211656164 in words is "two hundred eleven million, six hundred fifty-six thousand, one hundred sixty-four".