11211660225 has 96 divisors (see below), whose sum is σ = 21853601280. Its totient is φ = 5616000000.

The previous prime is 11211660151. The next prime is 11211660233. The reversal of 11211660225 is 52206611211.

11211660225 is a `hidden beast` number, since 1 + 1 + 21 + 16 + 602 + 25 = 666.

It is not a de Polignac number, because 11211660225 - 2⁹ = 11211659713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8617075 + ... + 8618375.

It is an arithmetic number, because the mean of its divisors is an integer number (227641680).

Almost surely, 2^11211660225 is an apocalyptic number.

11211660225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11211660225 is a deficient number, since it is larger than the sum of its proper divisors (10641941055).

11211660225 is a wasteful number, since it uses less digits than its factorization.

11211660225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088 (or 2077 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 11211660225 in words is "eleven billion, two hundred eleven million, six hundred sixty thousand, two hundred twenty-five".