551850371665 has 4 divisors (see below), whose sum is σ = 662220446004. Its totient is φ = 441480297328.

The previous prime is 551850371623. The next prime is 551850371687. The reversal of 551850371665 is 566173058155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566173058155 = 5 ⋅113234611631.

It can be written as a sum of positive squares in 2 ways, for example, as 243506719296 + 308343652369 = 493464^2 + 555287^2 .

It is a cyclic number.

It is not a de Polignac number, because 551850371665 - 2⁹ = 551850371153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 55185037162 + ... + 55185037171.

It is an arithmetic number, because the mean of its divisors is an integer number (165555111501).

Almost surely, 2^551850371665 is an apocalyptic number.

It is an amenable number.

551850371665 is a deficient number, since it is larger than the sum of its proper divisors (110370074339).

551850371665 is a wasteful number, since it uses less digits than its factorization.

551850371665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110370074338.

The product of its (nonzero) digits is 3780000, while the sum is 52.

The spelling of 551850371665 in words is "five hundred fifty-one billion, eight hundred fifty million, three hundred seventy-one thousand, six hundred sixty-five".