100556121506 has 4 divisors (see below), whose sum is σ = 150834182262. Its totient is φ = 50278060752.

The previous prime is 100556121487. The next prime is 100556121539. The reversal of 100556121506 is 605121655001.

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

It can be written as a sum of positive squares in only one way, i.e., 91924782481 + 8631339025 = 303191^2 + 92905^2 .

It is a super-2 number, since 2×100556121506² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 25139030375 + ... + 25139030378.

Almost surely, 2^100556121506 is an apocalyptic number.

100556121506 is a deficient number, since it is larger than the sum of its proper divisors (50278060756).

100556121506 is an equidigital number, since it uses as much as digits as its factorization.

100556121506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50278060755.

The product of its (nonzero) digits is 9000, while the sum is 32.

Adding to 100556121506 its reverse (605121655001), we get a palindrome (705677776507).

The spelling of 100556121506 in words is "one hundred billion, five hundred fifty-six million, one hundred twenty-one thousand, five hundred six".