666777041 has 4 divisors (see below), whose sum is σ = 762030912. Its totient is φ = 571523172.

The previous prime is 666777029. The next prime is 666777073. The reversal of 666777041 is 140777666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 140777666 = 2 ⋅70388833.

It is a cyclic number.

It is not a de Polignac number, because 666777041 - 2¹⁸ = 666514897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666776983 and 666777001.

It is not an unprimeable number, because it can be changed into a prime (666777941) 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, 47626925 + ... + 47626938.

It is an arithmetic number, because the mean of its divisors is an integer number (190507728).

Almost surely, 2^666777041 is an apocalyptic number.

It is an amenable number.

666777041 is a deficient number, since it is larger than the sum of its proper divisors (95253871).

666777041 is an equidigital number, since it uses as much as digits as its factorization.

666777041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95253870.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 666777041 is about 25822.0262760303. The cubic root of 666777041 is about 873.6286725067.

The spelling of 666777041 in words is "six hundred sixty-six million, seven hundred seventy-seven thousand, forty-one".