2665720531 has 2 divisors, whose sum is σ = 2665720532. Its totient is φ = 2665720530.

The previous prime is 2665720523. The next prime is 2665720559. The reversal of 2665720531 is 1350275662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2665720531 - 2³ = 2665720523 is a prime.

It is a super-2 number, since 2×2665720531² = 14212131898789843922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2665720591) 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, 1332860265 + 1332860266.

It is an arithmetic number, because the mean of its divisors is an integer number (1332860266).

Almost surely, 2^2665720531 is an apocalyptic number.

2665720531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665720531 is an equidigital number, since it uses as much as digits as its factorization.

2665720531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 2665720531 is about 51630.6162175119. The cubic root of 2665720531 is about 1386.5585258434.

The spelling of 2665720531 in words is "two billion, six hundred sixty-five million, seven hundred twenty thousand, five hundred thirty-one".