55720012100 has 18 divisors (see below), whose sum is σ = 120912426474. Its totient is φ = 22288004800.

The previous prime is 55720012091. The next prime is 55720012147. The reversal of 55720012100 is 121002755.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 19914289924 + 35805722176 = 141118^2 + 189224^2 .

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 in 5 ways as a sum of consecutive naturals, for example, 278599961 + ... + 278600160.

Almost surely, 2^55720012100 is an apocalyptic number.

55720012100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55720012100 is an abundant number, since it is smaller than the sum of its proper divisors (65192414374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55720012100 is a wasteful number, since it uses less digits than its factorization.

55720012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557200135 (or 557200128 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

Adding to 55720012100 its reverse (121002755), we get a palindrome (55841014855).

The spelling of 55720012100 in words is "fifty-five billion, seven hundred twenty million, twelve thousand, one hundred".