2172651865 has 8 divisors (see below), whose sum is σ = 2627712000. Its totient is φ = 1724434992.

The previous prime is 2172651863. The next prime is 2172651883. The reversal of 2172651865 is 5681562712.

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

It is a cyclic number.

It is not a de Polignac number, because 2172651865 - 2¹ = 2172651863 is a prime.

It is a super-2 number, since 2×2172651865² = 9440832252975956450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2172651863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1710115 + ... + 1711384.

It is an arithmetic number, because the mean of its divisors is an integer number (328464000).

Almost surely, 2^2172651865 is an apocalyptic number.

It is an amenable number.

2172651865 is a deficient number, since it is larger than the sum of its proper divisors (455060135).

2172651865 is a wasteful number, since it uses less digits than its factorization.

2172651865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3421631.

The product of its digits is 201600, while the sum is 43.

The square root of 2172651865 is about 46611.7138174515. The cubic root of 2172651865 is about 1295.1797557106.

The spelling of 2172651865 in words is "two billion, one hundred seventy-two million, six hundred fifty-one thousand, eight hundred sixty-five".