8378629561 has 2 divisors, whose sum is σ = 8378629562. Its totient is φ = 8378629560.

The previous prime is 8378629517. The next prime is 8378629577. The reversal of 8378629561 is 1659268738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8377923961 + 705600 = 91531^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 8378629561 - 2¹¹ = 8378627513 is a prime.

It is a super-3 number, since 3×8378629561³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (8378621561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4189314780 + 4189314781.

It is an arithmetic number, because the mean of its divisors is an integer number (4189314781).

Almost surely, 2^8378629561 is an apocalyptic number.

It is an amenable number.

8378629561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8378629561 is an equidigital number, since it uses as much as digits as its factorization.

8378629561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 55.

The square root of 8378629561 is about 91534.8543506789. The cubic root of 8378629561 is about 2031.0673737556.

The spelling of 8378629561 in words is "eight billion, three hundred seventy-eight million, six hundred twenty-nine thousand, five hundred sixty-one".