666610741 has 4 divisors (see below), whose sum is σ = 668713932. Its totient is φ = 664507552.

The previous prime is 666610739. The next prime is 666610751. The reversal of 666610741 is 147016666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 147016666 = 2 ⋅73508333.

It can be written as a sum of positive squares in 2 ways, for example, as 252651025 + 413959716 = 15895^2 + 20346^2 .

It is a cyclic number.

It is not a de Polignac number, because 666610741 - 2¹ = 666610739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666610741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666610751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051120 + ... + 1051753.

It is an arithmetic number, because the mean of its divisors is an integer number (167178483).

Almost surely, 2^666610741 is an apocalyptic number.

It is an amenable number.

666610741 is a deficient number, since it is larger than the sum of its proper divisors (2103191).

666610741 is a wasteful number, since it uses less digits than its factorization.

666610741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103190.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 666610741 is about 25818.8059561243. The cubic root of 666610741 is about 873.5560362683.

The spelling of 666610741 in words is "six hundred sixty-six million, six hundred ten thousand, seven hundred forty-one".