211623164660 has 12 divisors (see below), whose sum is σ = 444408645828. Its totient is φ = 84649265856.

The previous prime is 211623164659. The next prime is 211623164713. The reversal of 211623164660 is 66461326112.

It can be written as a sum of positive squares in 2 ways, for example, as 104534529124 + 107088635536 = 323318^2 + 327244^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5290579097 + ... + 5290579136.

It is an arithmetic number, because the mean of its divisors is an integer number (37034053819).

Almost surely, 2^211623164660 is an apocalyptic number.

211623164660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211623164660 is an abundant number, since it is smaller than the sum of its proper divisors (232785481168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211623164660 is a wasteful number, since it uses less digits than its factorization.

211623164660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10581158242 (or 10581158240 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 211623164660 in words is "two hundred eleven billion, six hundred twenty-three million, one hundred sixty-four thousand, six hundred sixty".