69836643649 has 2 divisors, whose sum is σ = 69836643650. Its totient is φ = 69836643648.

The previous prime is 69836643601. The next prime is 69836643689. The reversal of 69836643649 is 94634663896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42675296400 + 27161347249 = 206580^2 + 164807^2 .

It is a cyclic number.

It is not a de Polignac number, because 69836643649 - 2²³ = 69828255041 is a prime.

It is not a weakly prime, because it can be changed into another prime (69836643689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34918321824 + 34918321825.

It is an arithmetic number, because the mean of its divisors is an integer number (34918321825).

Almost surely, 2^69836643649 is an apocalyptic number.

It is an amenable number.

69836643649 is a deficient number, since it is larger than the sum of its proper divisors (1).

69836643649 is an equidigital number, since it uses as much as digits as its factorization.

69836643649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120932352, while the sum is 64.

The spelling of 69836643649 in words is "sixty-nine billion, eight hundred thirty-six million, six hundred forty-three thousand, six hundred forty-nine".