211663711476890 has 8 divisors (see below), whose sum is σ = 380994680658420. Its totient is φ = 84665484590752.

The previous prime is 211663711476869. The next prime is 211663711476923. The reversal of 211663711476890 is 98674117366112.

It is a Cunningham number, because it is equal to 14548667²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 211663711476889 + 1 = 14548667^2 + 1^2 .

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

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, 10583185573835 + ... + 10583185573854.

Almost surely, 2^{211663711476890} is an apocalyptic number.

211663711476890 is a deficient number, since it is larger than the sum of its proper divisors (169330969181530).

211663711476890 is a wasteful number, since it uses less digits than its factorization.

211663711476890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21166371147696.

The product of its (nonzero) digits is 18289152, while the sum is 62.

The spelling of 211663711476890 in words is "two hundred eleven trillion, six hundred sixty-three billion, seven hundred eleven million, four hundred seventy-six thousand, eight hundred ninety".