55151721560 has 128 divisors (see below), whose sum is σ = 137004799680. Its totient is φ = 19855300608.

The previous prime is 55151721557. The next prime is 55151721577. The reversal of 55151721560 is 6512715155.

It is a happy number.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 4486142 + ... + 4498418.

Almost surely, 2^55151721560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55151721560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68502399840).

55151721560 is an abundant number, since it is smaller than the sum of its proper divisors (81853078120).

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

55151721560 is a wasteful number, since it uses less digits than its factorization.

55151721560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12517 (or 12513 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 38.

The spelling of 55151721560 in words is "fifty-five billion, one hundred fifty-one million, seven hundred twenty-one thousand, five hundred sixty".