136665806571447 has 16 divisors (see below), whose sum is σ = 187926954209280. Its totient is φ = 88290966036672.

The previous prime is 136665806571397. The next prime is 136665806571451. The reversal of 136665806571447 is 744175608566631.

It is not a de Polignac number, because 136665806571447 - 2¹⁴ = 136665806555063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136665806571467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4170947622 + ... + 4170980387.

It is an arithmetic number, because the mean of its divisors is an integer number (11745434638080).

Almost surely, 2^{136665806571447} is an apocalyptic number.

136665806571447 is a deficient number, since it is larger than the sum of its proper divisors (51261147637833).

136665806571447 is a wasteful number, since it uses less digits than its factorization.

136665806571447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8341928182.

The product of its (nonzero) digits is 609638400, while the sum is 69.

The spelling of 136665806571447 in words is "one hundred thirty-six trillion, six hundred sixty-five billion, eight hundred six million, five hundred seventy-one thousand, four hundred forty-seven".