2665494521 has 2 divisors, whose sum is σ = 2665494522. Its totient is φ = 2665494520.

The previous prime is 2665494473. The next prime is 2665494529. The reversal of 2665494521 is 1254945662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1803191296 + 862303225 = 42464^2 + 29365^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665494521 - 2⁶ = 2665494457 is a prime.

It is a super-2 number, since 2×2665494521² = 14209722082962038882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2665494529) 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 as a sum of consecutive naturals, namely, 1332747260 + 1332747261.

It is an arithmetic number, because the mean of its divisors is an integer number (1332747261).

Almost surely, 2^2665494521 is an apocalyptic number.

It is an amenable number.

2665494521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665494521 is an equidigital number, since it uses as much as digits as its factorization.

2665494521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 44.

The square root of 2665494521 is about 51628.4274503882. The cubic root of 2665494521 is about 1386.5193388211.

The spelling of 2665494521 in words is "two billion, six hundred sixty-five million, four hundred ninety-four thousand, five hundred twenty-one".