7899010100081 has 2 divisors, whose sum is σ = 7899010100082. Its totient is φ = 7899010100080.

The previous prime is 7899010100071. The next prime is 7899010100141. The reversal of 7899010100081 is 1800010109987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7851433765681 + 47576334400 = 2802041^2 + 218120^2 .

It is an emirp because it is prime and its reverse (1800010109987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7899010100081 - 2⁶ = 7899010100017 is a prime.

It is a super-2 number, since 2×7899010100081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7899010100071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3949505050040 + 3949505050041.

It is an arithmetic number, because the mean of its divisors is an integer number (3949505050041).

Almost surely, 2^{7899010100081} is an apocalyptic number.

It is an amenable number.

7899010100081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7899010100081 is an equidigital number, since it uses as much as digits as its factorization.

7899010100081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 44.

The spelling of 7899010100081 in words is "seven trillion, eight hundred ninety-nine billion, ten million, one hundred thousand, eighty-one".