666100495 has 8 divisors (see below), whose sum is σ = 801336384. Its totient is φ = 531536544.

The previous prime is 666100489. The next prime is 666100543. The reversal of 666100495 is 594001666.

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

It is a cyclic number.

It is not a de Polignac number, because 666100495 - 2⁷ = 666100367 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 165799 + ... + 169768.

It is an arithmetic number, because the mean of its divisors is an integer number (100167048).

Almost surely, 2^666100495 is an apocalyptic number.

666100495 is a deficient number, since it is larger than the sum of its proper divisors (135235889).

666100495 is a wasteful number, since it uses less digits than its factorization.

666100495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335969.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 666100495 is about 25808.9227787601. The cubic root of 666100495 is about 873.3330964428. Note that the first 3 decimals are identical.

The spelling of 666100495 in words is "six hundred sixty-six million, one hundred thousand, four hundred ninety-five".