69216812129 has 2 divisors, whose sum is σ = 69216812130. Its totient is φ = 69216812128.

The previous prime is 69216812123. The next prime is 69216812149. The reversal of 69216812129 is 92121861296.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61765669729 + 7451142400 = 248527^2 + 86320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69216812129 is a prime.

It is not a weakly prime, because it can be changed into another prime (69216812123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34608406064 + 34608406065.

It is an arithmetic number, because the mean of its divisors is an integer number (34608406065).

Almost surely, 2^69216812129 is an apocalyptic number.

It is an amenable number.

69216812129 is a deficient number, since it is larger than the sum of its proper divisors (1).

69216812129 is an equidigital number, since it uses as much as digits as its factorization.

69216812129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The spelling of 69216812129 in words is "sixty-nine billion, two hundred sixteen million, eight hundred twelve thousand, one hundred twenty-nine".