660161211 has 4 divisors (see below), whose sum is σ = 880214952. Its totient is φ = 440107472.

The previous prime is 660161189. The next prime is 660161219. The reversal of 660161211 is 112161066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660161211 - 2⁷ = 660161083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660161219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110026866 + ... + 110026871.

It is an arithmetic number, because the mean of its divisors is an integer number (220053738).

Almost surely, 2^660161211 is an apocalyptic number.

660161211 is a deficient number, since it is larger than the sum of its proper divisors (220053741).

660161211 is a wasteful number, since it uses less digits than its factorization.

660161211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220053740.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 660161211 is about 25693.6025305912. The cubic root of 660161211 is about 870.7296521195.

The spelling of 660161211 in words is "six hundred sixty million, one hundred sixty-one thousand, two hundred eleven".