828197666 has 4 divisors (see below), whose sum is σ = 1242296502. Its totient is φ = 414098832.

The previous prime is 828197651. The next prime is 828197681. The reversal of 828197666 is 666791828.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (828197651) and next prime (828197681).

It can be written as a sum of positive squares in only one way, i.e., 806844025 + 21353641 = 28405^2 + 4621^2 .

It is a super-2 number, since 2×828197666² = 1371822747935695112, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207049415 + ... + 207049418.

Almost surely, 2^828197666 is an apocalyptic number.

828197666 is a deficient number, since it is larger than the sum of its proper divisors (414098836).

828197666 is a wasteful number, since it uses less digits than its factorization.

828197666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414098835.

The product of its digits is 1741824, while the sum is 53.

The square root of 828197666 is about 28778.4236190935. The cubic root of 828197666 is about 939.0989048473.

The spelling of 828197666 in words is "eight hundred twenty-eight million, one hundred ninety-seven thousand, six hundred sixty-six".