655544444551 has 4 divisors (see below), whose sum is σ = 666655367400. Its totient is φ = 644433521704.

The previous prime is 655544444549. The next prime is 655544444557. The reversal of 655544444551 is 155444445556.

655544444551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 655544444551 - 2¹ = 655544444549 is a prime.

It is a super-2 number, since 2×655544444551² (a number of 24 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 (655544444557) 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, 5555461336 + ... + 5555461453.

It is an arithmetic number, because the mean of its divisors is an integer number (166663841850).

Almost surely, 2^655544444551 is an apocalyptic number.

655544444551 is a deficient number, since it is larger than the sum of its proper divisors (11110922849).

655544444551 is a wasteful number, since it uses less digits than its factorization.

655544444551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11110922848.

The product of its digits is 19200000, while the sum is 52.

The spelling of 655544444551 in words is "six hundred fifty-five billion, five hundred forty-four million, four hundred forty-four thousand, five hundred fifty-one".