9554661643 has 2 divisors, whose sum is σ = 9554661644. Its totient is φ = 9554661642.

The previous prime is 9554661601. The next prime is 9554661673. The reversal of 9554661643 is 3461664559.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9554661643 is a prime.

It is a super-2 number, since 2×9554661643² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9554661673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4777330821 + 4777330822.

It is an arithmetic number, because the mean of its divisors is an integer number (4777330822).

Almost surely, 2^9554661643 is an apocalyptic number.

9554661643 is a deficient number, since it is larger than the sum of its proper divisors (1).

9554661643 is an equidigital number, since it uses as much as digits as its factorization.

9554661643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 49.

The square root of 9554661643 is about 97747.9495590572. The cubic root of 9554661643 is about 2121.9660800852.

The spelling of 9554661643 in words is "nine billion, five hundred fifty-four million, six hundred sixty-one thousand, six hundred forty-three".