2171165551 has 8 divisors (see below), whose sum is σ = 2185030400. Its totient is φ = 2157344280.

The previous prime is 2171165471. The next prime is 2171165609. The reversal of 2171165551 is 1555611712.

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

It is not a de Polignac number, because 2171165551 - 2¹⁵ = 2171132783 is a prime.

It is a super-3 number, since 3×2171165551³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171165851) 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, 92140 + ... + 113278.

It is an arithmetic number, because the mean of its divisors is an integer number (273128800).

Almost surely, 2^2171165551 is an apocalyptic number.

2171165551 is a deficient number, since it is larger than the sum of its proper divisors (13864849).

2171165551 is a wasteful number, since it uses less digits than its factorization.

2171165551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21789.

The product of its digits is 10500, while the sum is 34.

The square root of 2171165551 is about 46595.7675223834. The cubic root of 2171165551 is about 1294.8843436113.

The spelling of 2171165551 in words is "two billion, one hundred seventy-one million, one hundred sixty-five thousand, five hundred fifty-one".