101220199966 has 32 divisors (see below), whose sum is σ = 155814543360. Its totient is φ = 49303223424.

The previous prime is 101220199963. The next prime is 101220199973. The reversal of 101220199966 is 669991022101.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220199963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3968731 + ... + 3994153.

It is an arithmetic number, because the mean of its divisors is an integer number (4869204480).

Almost surely, 2^101220199966 is an apocalyptic number.

101220199966 is a deficient number, since it is larger than the sum of its proper divisors (54594343394).

101220199966 is a wasteful number, since it uses less digits than its factorization.

101220199966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25840.

The product of its (nonzero) digits is 104976, while the sum is 46.

The spelling of 101220199966 in words is "one hundred one billion, two hundred twenty million, one hundred ninety-nine thousand, nine hundred sixty-six".