102643357081 has 4 divisors (see below), whose sum is σ = 102833086564. Its totient is φ = 102453627600.

The previous prime is 102643357073. The next prime is 102643357093. The reversal of 102643357081 is 180753346201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180753346201 = 37 ⋅4885225573.

It can be written as a sum of positive squares in 2 ways, for example, as 71725409856 + 30917947225 = 267816^2 + 175835^2 .

It is a cyclic number.

It is not a de Polignac number, because 102643357081 - 2³ = 102643357073 is a prime.

It is a super-2 number, since 2×102643357081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102643357021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94863930 + ... + 94865011.

It is an arithmetic number, because the mean of its divisors is an integer number (25708271641).

Almost surely, 2^102643357081 is an apocalyptic number.

It is an amenable number.

102643357081 is a deficient number, since it is larger than the sum of its proper divisors (189729483).

102643357081 is an equidigital number, since it uses as much as digits as its factorization.

102643357081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189729482.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 102643357081 in words is "one hundred two billion, six hundred forty-three million, three hundred fifty-seven thousand, eighty-one".