666899054 has 4 divisors (see below), whose sum is σ = 1000348584. Its totient is φ = 333449526.

The previous prime is 666899041. The next prime is 666899059. The reversal of 666899054 is 450998666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 450998666 = 2 ⋅225499333.

It is a junction number, because it is equal to n+sod(n) for n = 666898987 and 666899005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666899059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166724762 + ... + 166724765.

It is an arithmetic number, because the mean of its divisors is an integer number (250087146).

Almost surely, 2^666899054 is an apocalyptic number.

666899054 is a deficient number, since it is larger than the sum of its proper divisors (333449530).

666899054 is a wasteful number, since it uses less digits than its factorization.

666899054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333449529.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The square root of 666899054 is about 25824.3887439761. The cubic root of 666899054 is about 873.6819574617.

The spelling of 666899054 in words is "six hundred sixty-six million, eight hundred ninety-nine thousand, fifty-four".