2165020749 has 24 divisors (see below), whose sum is σ = 3260135424. Its totient is φ = 1382940000.

The previous prime is 2165020747. The next prime is 2165020763. The reversal of 2165020749 is 9470205612.

It is not a de Polignac number, because 2165020749 - 2¹ = 2165020747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165020747) 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, 10237 + ... + 66594.

It is an arithmetic number, because the mean of its divisors is an integer number (135838976).

Almost surely, 2^2165020749 is an apocalyptic number.

It is an amenable number.

2165020749 is a deficient number, since it is larger than the sum of its proper divisors (1095114675).

2165020749 is a wasteful number, since it uses less digits than its factorization.

2165020749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76969 (or 76966 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 2165020749 is about 46529.7834617785. The cubic root of 2165020749 is about 1293.6616015776.

The spelling of 2165020749 in words is "two billion, one hundred sixty-five million, twenty thousand, seven hundred forty-nine".