55720121611 has 12 divisors (see below), whose sum is σ = 70709765400. Its totient is φ = 43418276160.

The previous prime is 55720121603. The next prime is 55720121623. The reversal of 55720121611 is 11612102755.

It is not a de Polignac number, because 55720121611 - 2³ = 55720121603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55720121651) 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 11 ways as a sum of consecutive naturals, for example, 51687886 + ... + 51688963.

It is an arithmetic number, because the mean of its divisors is an integer number (5892480450).

Almost surely, 2^55720121611 is an apocalyptic number.

55720121611 is a deficient number, since it is larger than the sum of its proper divisors (14989643789).

55720121611 is a wasteful number, since it uses less digits than its factorization.

55720121611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103376874 (or 103376867 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 55720121611 in words is "fifty-five billion, seven hundred twenty million, one hundred twenty-one thousand, six hundred eleven".