61664211 has 12 divisors (see below), whose sum is σ = 101794992. Its totient is φ = 35236656.

The previous prime is 61664203. The next prime is 61664221. The reversal of 61664211 is 11246616.

61664211 is a `hidden beast` number, since 6 + 1 + 6 + 642 + 11 = 666.

It is not a de Polignac number, because 61664211 - 2³ = 61664203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61664221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 489336 + ... + 489461.

It is an arithmetic number, because the mean of its divisors is an integer number (8482916).

Almost surely, 2^61664211 is an apocalyptic number.

61664211 is a deficient number, since it is larger than the sum of its proper divisors (40130781).

61664211 is a wasteful number, since it uses less digits than its factorization.

61664211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978810 (or 978807 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 61664211 is about 7852.6563021693. The cubic root of 61664211 is about 395.0733421469.

The spelling of 61664211 in words is "sixty-one million, six hundred sixty-four thousand, two hundred eleven".