660765413 has 64 divisors (see below), whose sum is σ = 920678400. Its totient is φ = 458472960.

The previous prime is 660765317. The next prime is 660765419. The reversal of 660765413 is 314567066.

It is a happy number.

It is not a de Polignac number, because 660765413 - 2²⁶ = 593656549 is a prime.

It is a super-2 number, since 2×660765413² = 873221862034121138, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660765419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2456243 + ... + 2456511.

It is an arithmetic number, because the mean of its divisors is an integer number (14385600).

Almost surely, 2^660765413 is an apocalyptic number.

It is an amenable number.

660765413 is a deficient number, since it is larger than the sum of its proper divisors (259912987).

660765413 is a wasteful number, since it uses less digits than its factorization.

660765413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 660765413 is about 25705.3576711160. The cubic root of 660765413 is about 870.9952115867.

The spelling of 660765413 in words is "six hundred sixty million, seven hundred sixty-five thousand, four hundred thirteen".