551299991721 has 8 divisors (see below), whose sum is σ = 735698703840. Its totient is φ = 367217303712.

The previous prime is 551299991719. The next prime is 551299991831. The reversal of 551299991721 is 127199992155.

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

It is not a de Polignac number, because 551299991721 - 2¹ = 551299991719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551299990721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79001956 + ... + 79008933.

It is an arithmetic number, because the mean of its divisors is an integer number (91962337980).

Almost surely, 2^551299991721 is an apocalyptic number.

It is an amenable number.

551299991721 is a deficient number, since it is larger than the sum of its proper divisors (184398712119).

551299991721 is a wasteful number, since it uses less digits than its factorization.

551299991721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158012055.

The product of its digits is 4592700, while the sum is 60.

The spelling of 551299991721 in words is "five hundred fifty-one billion, two hundred ninety-nine million, nine hundred ninety-one thousand, seven hundred twenty-one".