7820163397 has 2 divisors, whose sum is σ = 7820163398. Its totient is φ = 7820163396.

The previous prime is 7820163391. The next prime is 7820163401. The reversal of 7820163397 is 7933610287.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6983276356 + 836887041 = 83566^2 + 28929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7820163397 is a prime.

It is a super-2 number, since 2×7820163397² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7820163391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910081698 + 3910081699.

It is an arithmetic number, because the mean of its divisors is an integer number (3910081699).

Almost surely, 2^7820163397 is an apocalyptic number.

It is an amenable number.

7820163397 is a deficient number, since it is larger than the sum of its proper divisors (1).

7820163397 is an equidigital number, since it uses as much as digits as its factorization.

7820163397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 7820163397 is about 88431.6877425734. The cubic root of 7820163397 is about 1984.8998967765.

The spelling of 7820163397 in words is "seven billion, eight hundred twenty million, one hundred sixty-three thousand, three hundred ninety-seven".