102210163661 has 4 divisors (see below), whose sum is σ = 104703094524. Its totient is φ = 99717232800.

The previous prime is 102210163637. The next prime is 102210163747. The reversal of 102210163661 is 166361012201.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35391015625 + 66819148036 = 188125^2 + 258494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102210163661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102210163361) 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, 1246465370 + ... + 1246465451.

It is an arithmetic number, because the mean of its divisors is an integer number (26175773631).

Almost surely, 2^102210163661 is an apocalyptic number.

It is an amenable number.

102210163661 is a deficient number, since it is larger than the sum of its proper divisors (2492930863).

102210163661 is an equidigital number, since it uses as much as digits as its factorization.

102210163661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2492930862.

The product of its (nonzero) digits is 2592, while the sum is 29.

Adding to 102210163661 its reverse (166361012201), we get a palindrome (268571175862).

The spelling of 102210163661 in words is "one hundred two billion, two hundred ten million, one hundred sixty-three thousand, six hundred sixty-one".