689935040029 has 2 divisors, whose sum is σ = 689935040030. Its totient is φ = 689935040028.

The previous prime is 689935039931. The next prime is 689935040059. The reversal of 689935040029 is 920040539986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624887088004 + 65047952025 = 790498^2 + 255045^2 .

It is a cyclic number.

It is not a de Polignac number, because 689935040029 - 2⁷ = 689935039901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689935040059) 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 as a sum of consecutive naturals, namely, 344967520014 + 344967520015.

It is an arithmetic number, because the mean of its divisors is an integer number (344967520015).

Almost surely, 2^689935040029 is an apocalyptic number.

It is an amenable number.

689935040029 is a deficient number, since it is larger than the sum of its proper divisors (1).

689935040029 is an equidigital number, since it uses as much as digits as its factorization.

689935040029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 689935040029 in words is "six hundred eighty-nine billion, nine hundred thirty-five million, forty thousand, twenty-nine".