8237666021 has 8 divisors (see below), whose sum is σ = 9177241080. Its totient is φ = 7341792192.

The previous prime is 8237665913. The next prime is 8237666029. The reversal of 8237666021 is 1206667328.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 85562500 + 8152103521 = 9250^2 + 90289^2 .

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-8237666021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8237666021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8237666029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10924910 + ... + 10925663.

It is an arithmetic number, because the mean of its divisors is an integer number (1147155135).

Almost surely, 2^8237666021 is an apocalyptic number.

It is an amenable number.

8237666021 is a deficient number, since it is larger than the sum of its proper divisors (939575059).

8237666021 is a wasteful number, since it uses less digits than its factorization.

8237666021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21850615.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 8237666021 is about 90761.5889074227. The cubic root of 8237666021 is about 2019.6125470814.

The spelling of 8237666021 in words is "eight billion, two hundred thirty-seven million, six hundred sixty-six thousand, twenty-one".