551667221601 has 8 divisors (see below), whose sum is σ = 735559836384. Its totient is φ = 367776377280.

The previous prime is 551667221597. The next prime is 551667221603. The reversal of 551667221601 is 106122766155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 551667221601 - 2² = 551667221597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551667221603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722841 + ... + 1275081.

It is an arithmetic number, because the mean of its divisors is an integer number (91944979548).

Almost surely, 2^551667221601 is an apocalyptic number.

It is an amenable number.

551667221601 is a deficient number, since it is larger than the sum of its proper divisors (183892614783).

551667221601 is a wasteful number, since it uses less digits than its factorization.

551667221601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885231.

The product of its (nonzero) digits is 151200, while the sum is 42.

Adding to 551667221601 its reverse (106122766155), we get a palindrome (657789987756).

The spelling of 551667221601 in words is "five hundred fifty-one billion, six hundred sixty-seven million, two hundred twenty-one thousand, six hundred one".