100220666565 has 16 divisors (see below), whose sum is σ = 160735780800. Its totient is φ = 53323450752.

The previous prime is 100220666563. The next prime is 100220666603. The reversal of 100220666565 is 565666022001.

It is a happy number.

It is not a de Polignac number, because 100220666565 - 2¹ = 100220666563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100220666563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7966720 + ... + 7979289.

It is an arithmetic number, because the mean of its divisors is an integer number (10045986300).

Almost surely, 2^100220666565 is an apocalyptic number.

100220666565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100220666565 is a deficient number, since it is larger than the sum of its proper divisors (60515114235).

100220666565 is a wasteful number, since it uses less digits than its factorization.

100220666565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15946436.

The product of its (nonzero) digits is 129600, while the sum is 39.

Adding to 100220666565 its reverse (565666022001), we get a palindrome (665886688566).

The spelling of 100220666565 in words is "one hundred billion, two hundred twenty million, six hundred sixty-six thousand, five hundred sixty-five".