2164919517 has 6 divisors (see below), whose sum is σ = 3127105982. Its totient is φ = 1443279672.

The previous prime is 2164919431. The next prime is 2164919557. The reversal of 2164919517 is 7159194612.

It can be written as a sum of positive squares in only one way, i.e., 2106259236 + 58660281 = 45894^2 + 7659^2 .

It is not a de Polignac number, because 2164919517 - 2¹² = 2164915421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164919557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120273298 + ... + 120273315.

Almost surely, 2^2164919517 is an apocalyptic number.

It is an amenable number.

2164919517 is a deficient number, since it is larger than the sum of its proper divisors (962186465).

2164919517 is a wasteful number, since it uses less digits than its factorization.

2164919517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240546619 (or 240546616 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 2164919517 is about 46528.6956296864. The cubic root of 2164919517 is about 1293.6414382616.

The spelling of 2164919517 in words is "two billion, one hundred sixty-four million, nine hundred nineteen thousand, five hundred seventeen".