69050821661 has 2 divisors, whose sum is σ = 69050821662. Its totient is φ = 69050821660.

The previous prime is 69050821603. The next prime is 69050821717. The reversal of 69050821661 is 16612805096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68189399161 + 861422500 = 261131^2 + 29350^2 .

It is a cyclic number.

It is not a de Polignac number, because 69050821661 - 2³⁴ = 51870952477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69050821061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34525410830 + 34525410831.

It is an arithmetic number, because the mean of its divisors is an integer number (34525410831).

Almost surely, 2^69050821661 is an apocalyptic number.

It is an amenable number.

69050821661 is a deficient number, since it is larger than the sum of its proper divisors (1).

69050821661 is an equidigital number, since it uses as much as digits as its factorization.

69050821661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 69050821661 in words is "sixty-nine billion, fifty million, eight hundred twenty-one thousand, six hundred sixty-one".