8638211645 has 16 divisors (see below), whose sum is σ = 11862756480. Its totient is φ = 5915312064.

The previous prime is 8638211633. The next prime is 8638211671. The reversal of 8638211645 is 5461128368.

It is a cyclic number.

It is not a de Polignac number, because 8638211645 - 2²⁴ = 8621434429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8638211596 and 8638211605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141122 + ... + 192851.

It is an arithmetic number, because the mean of its divisors is an integer number (741422280).

Almost surely, 2^8638211645 is an apocalyptic number.

It is an amenable number.

8638211645 is a deficient number, since it is larger than the sum of its proper divisors (3224544835).

8638211645 is a wasteful number, since it uses less digits than its factorization.

8638211645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334724.

The product of its digits is 276480, while the sum is 44.

The square root of 8638211645 is about 92941.9799928966. The cubic root of 8638211645 is about 2051.8295501302.

The spelling of 8638211645 in words is "eight billion, six hundred thirty-eight million, two hundred eleven thousand, six hundred forty-five".