69121712809 has 2 divisors, whose sum is σ = 69121712810. Its totient is φ = 69121712808.

The previous prime is 69121712791. The next prime is 69121712839. The reversal of 69121712809 is 90821712196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68969264400 + 152448409 = 262620^2 + 12347^2 .

It is a cyclic number.

It is not a de Polignac number, because 69121712809 - 2²¹ = 69119615657 is a prime.

It is a super-2 number, since 2×69121712809² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (69121712839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34560856404 + 34560856405.

It is an arithmetic number, because the mean of its divisors is an integer number (34560856405).

Almost surely, 2^69121712809 is an apocalyptic number.

It is an amenable number.

69121712809 is a deficient number, since it is larger than the sum of its proper divisors (1).

69121712809 is an equidigital number, since it uses as much as digits as its factorization.

69121712809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 46.

The spelling of 69121712809 in words is "sixty-nine billion, one hundred twenty-one million, seven hundred twelve thousand, eight hundred nine".