55151721559 has 16 divisors (see below), whose sum is σ = 61049769984. Its totient is φ = 49404212800.

The previous prime is 55151721557. The next prime is 55151721577. The reversal of 55151721559 is 95512715155.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55151721559 - 2¹ = 55151721557 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 (55151721557) 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, 270819 + ... + 428539.

It is an arithmetic number, because the mean of its divisors is an integer number (3815610624).

Almost surely, 2^55151721559 is an apocalyptic number.

55151721559 is a deficient number, since it is larger than the sum of its proper divisors (5898048425).

55151721559 is a wasteful number, since it uses less digits than its factorization.

55151721559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158198.

The product of its digits is 393750, while the sum is 46.

The spelling of 55151721559 in words is "fifty-five billion, one hundred fifty-one million, seven hundred twenty-one thousand, five hundred fifty-nine".