2170778145 has 16 divisors (see below), whose sum is σ = 3475458240. Its totient is φ = 1157010624.

The previous prime is 2170778119. The next prime is 2170778179. The reversal of 2170778145 is 5418770712.

It is not a de Polignac number, because 2170778145 - 2⁷ = 2170778017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2170778097 and 2170778106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21355 + ... + 69264.

It is an arithmetic number, because the mean of its divisors is an integer number (217216140).

Almost surely, 2^2170778145 is an apocalyptic number.

It is an amenable number.

2170778145 is a deficient number, since it is larger than the sum of its proper divisors (1304680095).

2170778145 is a wasteful number, since it uses less digits than its factorization.

2170778145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92224.

The product of its (nonzero) digits is 109760, while the sum is 42.

The square root of 2170778145 is about 46591.6102426177. The cubic root of 2170778145 is about 1294.8073226454.

The spelling of 2170778145 in words is "two billion, one hundred seventy million, seven hundred seventy-eight thousand, one hundred forty-five".