666061505 has 16 divisors (see below), whose sum is σ = 826950144. Its totient is φ = 514477440.

The previous prime is 666061499. The next prime is 666061507. The reversal of 666061505 is 505160666.

666061505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666061505 - 2¹² = 666057409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666061507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66134 + ... + 75536.

It is an arithmetic number, because the mean of its divisors is an integer number (51684384).

Almost surely, 2^666061505 is an apocalyptic number.

It is an amenable number.

666061505 is a deficient number, since it is larger than the sum of its proper divisors (160888639).

666061505 is a wasteful number, since it uses less digits than its factorization.

666061505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9896.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 666061505 is about 25808.1674087875. The cubic root of 666061505 is about 873.3160560101.

The spelling of 666061505 in words is "six hundred sixty-six million, sixty-one thousand, five hundred five".