666273995 has 8 divisors (see below), whose sum is σ = 802502640. Its totient is φ = 531036640.

The previous prime is 666273973. The next prime is 666274001. The reversal of 666273995 is 599372666.

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

It is a de Polignac number, because none of the positive numbers 2^k-666273995 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246341 + ... + 249030.

It is an arithmetic number, because the mean of its divisors is an integer number (100312830).

Almost surely, 2^666273995 is an apocalyptic number.

666273995 is a deficient number, since it is larger than the sum of its proper divisors (136228645).

666273995 is a wasteful number, since it uses less digits than its factorization.

666273995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495645.

The product of its digits is 3674160, while the sum is 53.

The square root of 666273995 is about 25812.2838005474. The cubic root of 666273995 is about 873.4089159022.

The spelling of 666273995 in words is "six hundred sixty-six million, two hundred seventy-three thousand, nine hundred ninety-five".