69771392728209 has 12 divisors (see below), whose sum is σ = 103124642482576. Its totient is φ = 45432534799512.

The previous prime is 69771392728181. The next prime is 69771392728231. The reversal of 69771392728209 is 90282729317796.

69771392728209 is a `hidden beast` number, since 6 + 9 + 7 + 7 + 1 + 392 + 7 + 28 + 209 = 666.

It is not a de Polignac number, because 69771392728209 - 2¹⁹ = 69771392203921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69771392728409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90143917867 + ... + 90143918640.

Almost surely, 2^{69771392728209} is an apocalyptic number.

It is an amenable number.

69771392728209 is a deficient number, since it is larger than the sum of its proper divisors (33353249754367).

69771392728209 is a wasteful number, since it uses less digits than its factorization.

69771392728209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180287836556 (or 180287836553 counting only the distinct ones).

The product of its (nonzero) digits is 288054144, while the sum is 72.

The spelling of 69771392728209 in words is "sixty-nine trillion, seven hundred seventy-one billion, three hundred ninety-two million, seven hundred twenty-eight thousand, two hundred nine".