2199978165 has 64 divisors (see below), whose sum is σ = 4454184960. Its totient is φ = 900599040.

The previous prime is 2199978149. The next prime is 2199978217. The reversal of 2199978165 is 5618799912.

It is not a de Polignac number, because 2199978165 - 2⁴ = 2199978149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63171 + ... + 91599.

It is an arithmetic number, because the mean of its divisors is an integer number (69596640).

Almost surely, 2^2199978165 is an apocalyptic number.

It is an amenable number.

2199978165 is an abundant number, since it is smaller than the sum of its proper divisors (2254206795).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2199978165 is a wasteful number, since it uses less digits than its factorization.

2199978165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28522.

The product of its digits is 2449440, while the sum is 57.

The square root of 2199978165 is about 46903.9248357747. The cubic root of 2199978165 is about 1300.5871440471.

The spelling of 2199978165 in words is "two billion, one hundred ninety-nine million, nine hundred seventy-eight thousand, one hundred sixty-five".