6618858397 has 2 divisors, whose sum is σ = 6618858398. Its totient is φ = 6618858396.

The previous prime is 6618858361. The next prime is 6618858409. The reversal of 6618858397 is 7938588166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6281989081 + 336869316 = 79259^2 + 18354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6618858397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6618859397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3309429198 + 3309429199.

It is an arithmetic number, because the mean of its divisors is an integer number (3309429199).

Almost surely, 2^6618858397 is an apocalyptic number.

It is an amenable number.

6618858397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6618858397 is an equidigital number, since it uses as much as digits as its factorization.

6618858397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 61.

The square root of 6618858397 is about 81356.3666654307. The cubic root of 6618858397 is about 1877.5623299833.

The spelling of 6618858397 in words is "six billion, six hundred eighteen million, eight hundred fifty-eight thousand, three hundred ninety-seven".