551406203161 has 4 divisors (see below), whose sum is σ = 601534039824. Its totient is φ = 501278366500.

The previous prime is 551406203137. The next prime is 551406203167. The reversal of 551406203161 is 161302604155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551406203161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551406203167) 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 3 ways as a sum of consecutive naturals, for example, 25063918315 + ... + 25063918336.

It is an arithmetic number, because the mean of its divisors is an integer number (150383509956).

Almost surely, 2^551406203161 is an apocalyptic number.

It is an amenable number.

551406203161 is a deficient number, since it is larger than the sum of its proper divisors (50127836663).

551406203161 is a wasteful number, since it uses less digits than its factorization.

551406203161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50127836662.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 551406203161 in words is "five hundred fifty-one billion, four hundred six million, two hundred three thousand, one hundred sixty-one".