666998954 has 8 divisors (see below), whose sum is σ = 1010212320. Its totient is φ = 330261516.

The previous prime is 666998951. The next prime is 666998987. The reversal of 666998954 is 459899666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (666998951) 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, 1618724 + ... + 1619135.

It is an arithmetic number, because the mean of its divisors is an integer number (126276540).

Almost surely, 2^666998954 is an apocalyptic number.

666998954 is a deficient number, since it is larger than the sum of its proper divisors (343213366).

666998954 is a wasteful number, since it uses less digits than its factorization.

666998954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237964.

The product of its digits is 25194240, while the sum is 62.

The square root of 666998954 is about 25826.3228896411. The cubic root of 666998954 is about 873.7255804904.

The spelling of 666998954 in words is "six hundred sixty-six million, nine hundred ninety-eight thousand, nine hundred fifty-four".