55721012755 has 32 divisors (see below), whose sum is σ = 68943960000. Its totient is φ = 43214628864.

The previous prime is 55721012687. The next prime is 55721012771.

It is a happy number.

55721012755 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55721012755 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10735701 + ... + 10740889.

It is an arithmetic number, because the mean of its divisors is an integer number (2154498750).

Almost surely, 2^55721012755 is an apocalyptic number.

55721012755 is a deficient number, since it is larger than the sum of its proper divisors (13222947245).

55721012755 is a wasteful number, since it uses less digits than its factorization.

55721012755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5751.

The product of its (nonzero) digits is 122500, while the sum is 40.

It can be divided in two parts, 557210 and 12755, that added together give a palindrome (569965).

The spelling of 55721012755 in words is "fifty-five billion, seven hundred twenty-one million, twelve thousand, seven hundred fifty-five".