2128177065 has 24 divisors (see below), whose sum is σ = 3961016640. Its totient is φ = 972880608.

The previous prime is 2128177057. The next prime is 2128177069. The reversal of 2128177065 is 5607718212.

It is not a de Polignac number, because 2128177065 - 2³ = 2128177057 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2128177069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1447005 + ... + 1448474.

It is an arithmetic number, because the mean of its divisors is an integer number (165042360).

Almost surely, 2^2128177065 is an apocalyptic number.

It is an amenable number.

2128177065 is a deficient number, since it is larger than the sum of its proper divisors (1832839575).

2128177065 is a wasteful number, since it uses less digits than its factorization.

2128177065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895501 (or 2895494 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 2128177065 is about 46132.1695240967. The cubic root of 2128177065 is about 1286.2811922650.

It can be divided in two parts, 21281 and 77065, that added together give a triangular number (98346 = T₄₄₃).

The spelling of 2128177065 in words is "two billion, one hundred twenty-eight million, one hundred seventy-seven thousand, sixty-five".