551551280544421 has 4 divisors (see below), whose sum is σ = 565003750801644. Its totient is φ = 538098810287200.

The previous prime is 551551280544337. The next prime is 551551280544449. The reversal of 551551280544421 is 124445082155155.

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

It can be written as a sum of positive squares in 2 ways, for example, as 248442693064225 + 303108587480196 = 15762065^2 + 17410014^2 .

It is a cyclic number.

It is not a de Polignac number, because 551551280544421 - 2¹³ = 551551280536229 is a prime.

It is a super-2 number, since 2×551551280544421² (a number of 30 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 (551551280544461) 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, 6726235128550 + ... + 6726235128631.

It is an arithmetic number, because the mean of its divisors is an integer number (141250937700411).

Almost surely, 2^{551551280544421} is an apocalyptic number.

It is an amenable number.

551551280544421 is a deficient number, since it is larger than the sum of its proper divisors (13452470257223).

551551280544421 is a wasteful number, since it uses less digits than its factorization.

551551280544421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13452470257222.

The product of its (nonzero) digits is 6400000, while the sum is 52.

The spelling of 551551280544421 in words is "five hundred fifty-one trillion, five hundred fifty-one billion, two hundred eighty million, five hundred forty-four thousand, four hundred twenty-one".