665001061 has 2 divisors, whose sum is σ = 665001062. Its totient is φ = 665001060.

The previous prime is 665001049. The next prime is 665001067. The reversal of 665001061 is 160100566.

665001061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334670436 + 330330625 = 18294^2 + 18175^2 .

It is a cyclic number.

It is not a de Polignac number, because 665001061 - 2¹³ = 664992869 is a prime.

It is a super-2 number, since 2×665001061² = 884452822262251442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665001067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332500530 + 332500531.

It is an arithmetic number, because the mean of its divisors is an integer number (332500531).

Almost surely, 2^665001061 is an apocalyptic number.

It is an amenable number.

665001061 is a deficient number, since it is larger than the sum of its proper divisors (1).

665001061 is an equidigital number, since it uses as much as digits as its factorization.

665001061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 665001061 is about 25787.6144883547. The cubic root of 665001061 is about 872.8523377268.

The spelling of 665001061 in words is "six hundred sixty-five million, one thousand, sixty-one".