666761513 has 16 divisors (see below), whose sum is σ = 760237056. Its totient is φ = 578849040.

The previous prime is 666761453. The next prime is 666761531. The reversal of 666761513 is 315167666.

It is not a de Polignac number, because 666761513 - 2⁶ = 666761449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666761593) 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 15 ways as a sum of consecutive naturals, for example, 186206 + ... + 189752.

It is an arithmetic number, because the mean of its divisors is an integer number (47514816).

Almost surely, 2^666761513 is an apocalyptic number.

It is an amenable number.

666761513 is a deficient number, since it is larger than the sum of its proper divisors (93475543).

666761513 is a wasteful number, since it uses less digits than its factorization.

666761513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4324.

The product of its digits is 136080, while the sum is 41.

The square root of 666761513 is about 25821.7256007417. The cubic root of 666761513 is about 873.6218907238.

The spelling of 666761513 in words is "six hundred sixty-six million, seven hundred sixty-one thousand, five hundred thirteen".