211665520672 has 12 divisors (see below), whose sum is σ = 416716493886. Its totient is φ = 105832760320.

The previous prime is 211665520669. The next prime is 211665520679. The reversal of 211665520672 is 276025566112.

It can be written as a sum of positive squares in only one way, i.e., 205829171856 + 5836348816 = 453684^2 + 76396^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (211665520679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3307273729 + ... + 3307273792.

Almost surely, 2^211665520672 is an apocalyptic number.

It is an amenable number.

211665520672 is a deficient number, since it is larger than the sum of its proper divisors (205050973214).

211665520672 is an equidigital number, since it uses as much as digits as its factorization.

211665520672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6614547531 (or 6614547523 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 211665520672 in words is "two hundred eleven billion, six hundred sixty-five million, five hundred twenty thousand, six hundred seventy-two".