8621649559 has 2 divisors, whose sum is σ = 8621649560. Its totient is φ = 8621649558.

The previous prime is 8621649541. The next prime is 8621649601. The reversal of 8621649559 is 9559461268.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8621649559 - 2²⁵ = 8588095127 is a prime.

It is a super-2 number, since 2×8621649559² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8621649539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4310824779 + 4310824780.

It is an arithmetic number, because the mean of its divisors is an integer number (4310824780).

Almost surely, 2^8621649559 is an apocalyptic number.

8621649559 is a deficient number, since it is larger than the sum of its proper divisors (1).

8621649559 is an equidigital number, since it uses as much as digits as its factorization.

8621649559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 55.

The square root of 8621649559 is about 92852.8381849473. The cubic root of 8621649559 is about 2050.5173835094.

The spelling of 8621649559 in words is "eight billion, six hundred twenty-one million, six hundred forty-nine thousand, five hundred fifty-nine".