55528332781 has 4 divisors (see below), whose sum is σ = 56067442912. Its totient is φ = 54989222652.

The previous prime is 55528332749. The next prime is 55528332803. The reversal of 55528332781 is 18723382555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55528332781 - 2⁵ = 55528332749 is a prime.

It is a super-2 number, since 2×55528332781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55528332701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269554911 + ... + 269555116.

It is an arithmetic number, because the mean of its divisors is an integer number (14016860728).

Almost surely, 2^55528332781 is an apocalyptic number.

It is an amenable number.

55528332781 is a deficient number, since it is larger than the sum of its proper divisors (539110131).

55528332781 is a wasteful number, since it uses less digits than its factorization.

55528332781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539110130.

The product of its digits is 2016000, while the sum is 49.

The spelling of 55528332781 in words is "fifty-five billion, five hundred twenty-eight million, three hundred thirty-two thousand, seven hundred eighty-one".