551443170340261 has 4 divisors (see below), whose sum is σ = 551482919735692. Its totient is φ = 551403420944832.

The previous prime is 551443170340241. The next prime is 551443170340267. The reversal of 551443170340261 is 162043071344155.

It is a happy number.

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 448380370900036 + 103062799440225 = 21174994^2 + 10151985^2 .

It is a cyclic number.

It is not a de Polignac number, because 551443170340261 - 2⁷ = 551443170340133 is a prime.

It is a super-2 number, since 2×551443170340261² (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 (551443170340267) 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, 19874676906 + ... + 19874704651.

It is an arithmetic number, because the mean of its divisors is an integer number (137870729933923).

Almost surely, 2^{551443170340261} is an apocalyptic number.

It is an amenable number.

551443170340261 is a deficient number, since it is larger than the sum of its proper divisors (39749395431).

551443170340261 is a wasteful number, since it uses less digits than its factorization.

551443170340261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39749395430.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 551443170340261 in words is "five hundred fifty-one trillion, four hundred forty-three billion, one hundred seventy million, three hundred forty thousand, two hundred sixty-one".