495666661 has 8 divisors (see below), whose sum is σ = 596290880. Its totient is φ = 402496128.

The previous prime is 495666659. The next prime is 495666683. The reversal of 495666661 is 166666594.

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 495666661 - 2¹ = 495666659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (495666631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1863276 + ... + 1863541.

It is an arithmetic number, because the mean of its divisors is an integer number (74536360).

Almost surely, 2^495666661 is an apocalyptic number.

It is an amenable number.

495666661 is a deficient number, since it is larger than the sum of its proper divisors (100624219).

495666661 is a wasteful number, since it uses less digits than its factorization.

495666661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726843.

The product of its digits is 1399680, while the sum is 49.

The square root of 495666661 is about 22263.5725120655. The cubic root of 495666661 is about 791.4009542891.

It can be divided in two parts, 4956 and 66661, that added together give a palindrome (71617).

The spelling of 495666661 in words is "four hundred ninety-five million, six hundred sixty-six thousand, six hundred sixty-one".