5165764981 has 4 divisors (see below), whose sum is σ = 5563131532. Its totient is φ = 4768398432.

The previous prime is 5165764969. The next prime is 5165765093. The reversal of 5165764981 is 1894675615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 450882756 + 4714882225 = 21234^2 + 68665^2 .

It is a cyclic number.

It is not a de Polignac number, because 5165764981 - 2⁹ = 5165764469 is a prime.

It is a super-2 number, since 2×5165764981² = 53370255677851860722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5165764181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198683256 + ... + 198683281.

It is an arithmetic number, because the mean of its divisors is an integer number (1390782883).

Almost surely, 2^5165764981 is an apocalyptic number.

It is an amenable number.

5165764981 is a deficient number, since it is larger than the sum of its proper divisors (397366551).

5165764981 is a wasteful number, since it uses less digits than its factorization.

5165764981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397366550.

The product of its digits is 1814400, while the sum is 52.

The square root of 5165764981 is about 71873.2563684156. The cubic root of 5165764981 is about 1728.6678219207.

The spelling of 5165764981 in words is "five billion, one hundred sixty-five million, seven hundred sixty-four thousand, nine hundred eighty-one".