102202742689 has 4 divisors (see below), whose sum is σ = 102206495124. Its totient is φ = 102198990256.

The previous prime is 102202742671. The next prime is 102202742771. The reversal of 102202742689 is 986247202201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986247202201 = 499 ⋅1976447299.

It can be written as a sum of positive squares in 2 ways, for example, as 80066361600 + 22136381089 = 282960^2 + 148783^2 .

It is a cyclic number.

It is not a de Polignac number, because 102202742689 - 2⁹ = 102202742177 is a prime.

It is a super-2 number, since 2×102202742689² (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 (102202742189) 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, 1835062 + ... + 1889935.

It is an arithmetic number, because the mean of its divisors is an integer number (25551623781).

Almost surely, 2^102202742689 is an apocalyptic number.

It is an amenable number.

102202742689 is a deficient number, since it is larger than the sum of its proper divisors (3752435).

102202742689 is an equidigital number, since it uses as much as digits as its factorization.

102202742689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752434.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 102202742689 in words is "one hundred two billion, two hundred two million, seven hundred forty-two thousand, six hundred eighty-nine".