551099289661 has 4 divisors (see below), whose sum is σ = 552408314524. Its totient is φ = 549790264800.

The previous prime is 551099289659. The next prime is 551099289667. The reversal of 551099289661 is 166982990155.

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 291809557636 + 259289732025 = 540194^2 + 509205^2 .

It is a cyclic number.

It is not a de Polignac number, because 551099289661 - 2¹ = 551099289659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551099289661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551099289667) 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, 654511800 + ... + 654512641.

It is an arithmetic number, because the mean of its divisors is an integer number (138102078631).

Almost surely, 2^551099289661 is an apocalyptic number.

It is an amenable number.

551099289661 is a deficient number, since it is larger than the sum of its proper divisors (1309024863).

551099289661 is a wasteful number, since it uses less digits than its factorization.

551099289661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309024862.

The product of its (nonzero) digits is 10497600, while the sum is 61.

The spelling of 551099289661 in words is "five hundred fifty-one billion, ninety-nine million, two hundred eighty-nine thousand, six hundred sixty-one".