135677658438721 has 16 divisors (see below), whose sum is σ = 156123469361664. Its totient is φ = 115498387727424.

The previous prime is 135677658438683. The next prime is 135677658438731. The reversal of 135677658438721 is 127834856776531.

It is a cyclic number.

It is not a de Polignac number, because 135677658438721 - 2³⁹ = 135127902624833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135677658438731) 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, 27654130 + ... + 32188603.

It is an arithmetic number, because the mean of its divisors is an integer number (9757716835104).

Almost surely, 2^{135677658438721} is an apocalyptic number.

It is an amenable number.

135677658438721 is a deficient number, since it is larger than the sum of its proper divisors (20445810922943).

135677658438721 is a wasteful number, since it uses less digits than its factorization.

135677658438721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59844960.

The product of its digits is 1422489600, while the sum is 73.

The spelling of 135677658438721 in words is "one hundred thirty-five trillion, six hundred seventy-seven billion, six hundred fifty-eight million, four hundred thirty-eight thousand, seven hundred twenty-one".