2166173961 has 8 divisors (see below), whose sum is σ = 3300836544. Its totient is φ = 1237813680.

The previous prime is 2166173941. The next prime is 2166173963. The reversal of 2166173961 is 1693716612.

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

It is not a de Polignac number, because 2166173961 - 2¹³ = 2166165769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166173963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51575550 + ... + 51575591.

It is an arithmetic number, because the mean of its divisors is an integer number (412604568).

Almost surely, 2^2166173961 is an apocalyptic number.

2166173961 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2166173961 is a deficient number, since it is larger than the sum of its proper divisors (1134662583).

2166173961 is a wasteful number, since it uses less digits than its factorization.

2166173961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103151151.

The product of its digits is 81648, while the sum is 42.

The square root of 2166173961 is about 46542.1740038000. The cubic root of 2166173961 is about 1293.8912531529.

The spelling of 2166173961 in words is "two billion, one hundred sixty-six million, one hundred seventy-three thousand, nine hundred sixty-one".