8421697616 has 10 divisors (see below), whose sum is σ = 16317039162. Its totient is φ = 4210848800.

The previous prime is 8421697607. The next prime is 8421697621. The reversal of 8421697616 is 6167961248.

It can be written as a sum of positive squares in only one way, i.e., 7465651216 + 956046400 = 86404^2 + 30920^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263178035 + ... + 263178066.

Almost surely, 2^8421697616 is an apocalyptic number.

It is an amenable number.

8421697616 is a deficient number, since it is larger than the sum of its proper divisors (7895341546).

8421697616 is a wasteful number, since it uses less digits than its factorization.

8421697616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526356109 (or 526356103 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The square root of 8421697616 is about 91769.8077583254. The cubic root of 8421697616 is about 2034.5414768625.

The spelling of 8421697616 in words is "eight billion, four hundred twenty-one million, six hundred ninety-seven thousand, six hundred sixteen".