2176779945 has 8 divisors (see below), whose sum is σ = 3482847936. Its totient is φ = 1160949296.

The previous prime is 2176779929. The next prime is 2176779947. The reversal of 2176779945 is 5499776712.

It is a happy number.

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 2176779945 - 2⁴ = 2176779929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2176779947) 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, 72559317 + ... + 72559346.

It is an arithmetic number, because the mean of its divisors is an integer number (435355992).

Almost surely, 2^2176779945 is an apocalyptic number.

It is an amenable number.

2176779945 is a deficient number, since it is larger than the sum of its proper divisors (1306067991).

2176779945 is a wasteful number, since it uses less digits than its factorization.

2176779945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145118671.

The product of its digits is 6667920, while the sum is 57.

The square root of 2176779945 is about 46655.9743762790. The cubic root of 2176779945 is about 1295.9995254866. Note that the first 3 decimals are identical.

The spelling of 2176779945 in words is "two billion, one hundred seventy-six million, seven hundred seventy-nine thousand, nine hundred forty-five".