8865396557 has 2 divisors, whose sum is σ = 8865396558. Its totient is φ = 8865396556.

The previous prime is 8865396497. The next prime is 8865396563. The reversal of 8865396557 is 7556935688.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5127419236 + 3737977321 = 71606^2 + 61139^2 .

It is a cyclic number.

It is not a de Polignac number, because 8865396557 - 2¹⁶ = 8865331021 is a prime.

It is a super-2 number, since 2×8865396557² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8865396557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8865396157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4432698278 + 4432698279.

It is an arithmetic number, because the mean of its divisors is an integer number (4432698279).

Almost surely, 2^8865396557 is an apocalyptic number.

It is an amenable number.

8865396557 is a deficient number, since it is larger than the sum of its proper divisors (1).

8865396557 is an equidigital number, since it uses as much as digits as its factorization.

8865396557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432000, while the sum is 62.

The square root of 8865396557 is about 94156.2348280771. The cubic root of 8865396557 is about 2069.6618238344.

The spelling of 8865396557 in words is "eight billion, eight hundred sixty-five million, three hundred ninety-six thousand, five hundred fifty-seven".