662806756556666 has 8 divisors (see below), whose sum is σ = 994224030563700. Its totient is φ = 331398746368768.

The previous prime is 662806756556639. The next prime is 662806756556677. The reversal of 662806756556666 is 666655657608266.

It can be written as a sum of positive squares in 2 ways, for example, as 661688934589225 + 1117821967441 = 25723315^2 + 1057271^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2315775911 + ... + 2316062106.

Almost surely, 2^{662806756556666} is an apocalyptic number.

662806756556666 is a deficient number, since it is larger than the sum of its proper divisors (331417274007034).

662806756556666 is a wasteful number, since it uses less digits than its factorization.

662806756556666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631909568.

The product of its (nonzero) digits is 23514624000, while the sum is 80.

The spelling of 662806756556666 in words is "six hundred sixty-two trillion, eight hundred six billion, seven hundred fifty-six million, five hundred fifty-six thousand, six hundred sixty-six".