211604662261 has 8 divisors (see below), whose sum is σ = 222543489024. Its totient is φ = 200810720880.

The previous prime is 211604662259. The next prime is 211604662267. The reversal of 211604662261 is 162266406112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211604662261 - 2¹ = 211604662259 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 211604662261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211604662267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36218350 + ... + 36224191.

It is an arithmetic number, because the mean of its divisors is an integer number (27817936128).

Almost surely, 2^211604662261 is an apocalyptic number.

It is an amenable number.

211604662261 is a deficient number, since it is larger than the sum of its proper divisors (10938826763).

211604662261 is a wasteful number, since it uses less digits than its factorization.

211604662261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72442691.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 211604662261 in words is "two hundred eleven billion, six hundred four million, six hundred sixty-two thousand, two hundred sixty-one".