666923654 has 4 divisors (see below), whose sum is σ = 1000385484. Its totient is φ = 333461826.

The previous prime is 666923633. The next prime is 666923681. The reversal of 666923654 is 456329666.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 666923599 and 666923608.

It is a congruent number.

It is an unprimeable number.

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, 166730912 + ... + 166730915.

It is an arithmetic number, because the mean of its divisors is an integer number (250096371).

Almost surely, 2^666923654 is an apocalyptic number.

666923654 is a deficient number, since it is larger than the sum of its proper divisors (333461830).

666923654 is a wasteful number, since it uses less digits than its factorization.

666923654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333461829.

The product of its digits is 1399680, while the sum is 47.

The square root of 666923654 is about 25824.8650335292. The cubic root of 666923654 is about 873.6926998731.

The spelling of 666923654 in words is "six hundred sixty-six million, nine hundred twenty-three thousand, six hundred fifty-four".