8556387397 has 2 divisors, whose sum is σ = 8556387398. Its totient is φ = 8556387396.

The previous prime is 8556387391. The next prime is 8556387409. The reversal of 8556387397 is 7937836558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6072461476 + 2483925921 = 77926^2 + 49839^2 .

It is a cyclic number.

It is not a de Polignac number, because 8556387397 - 2⁷ = 8556387269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8556387391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4278193698 + 4278193699.

It is an arithmetic number, because the mean of its divisors is an integer number (4278193699).

Almost surely, 2^8556387397 is an apocalyptic number.

It is an amenable number.

8556387397 is a deficient number, since it is larger than the sum of its proper divisors (1).

8556387397 is an equidigital number, since it uses as much as digits as its factorization.

8556387397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38102400, while the sum is 61.

The square root of 8556387397 is about 92500.7426835050. The cubic root of 8556387397 is about 2045.3304302038.

The spelling of 8556387397 in words is "eight billion, five hundred fifty-six million, three hundred eighty-seven thousand, three hundred ninety-seven".