7820165401 has 2 divisors, whose sum is σ = 7820165402. Its totient is φ = 7820165400.

The previous prime is 7820165341. The next prime is 7820165411. The reversal of 7820165401 is 1045610287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7608026176 + 212139225 = 87224^2 + 14565^2 .

It is an emirp because it is prime and its reverse (1045610287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7820165401 - 2¹³ = 7820157209 is a prime.

It is a super-2 number, since 2×7820165401² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7820165411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910082700 + 3910082701.

It is an arithmetic number, because the mean of its divisors is an integer number (3910082701).

Almost surely, 2^7820165401 is an apocalyptic number.

It is an amenable number.

7820165401 is a deficient number, since it is larger than the sum of its proper divisors (1).

7820165401 is an equidigital number, since it uses as much as digits as its factorization.

7820165401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 7820165401 is about 88431.6990733527. The cubic root of 7820165401 is about 1984.9000663270.

Adding to 7820165401 its reverse (1045610287), we get a palindrome (8865775688).

The spelling of 7820165401 in words is "seven billion, eight hundred twenty million, one hundred sixty-five thousand, four hundred one".