135879666978531 has 8 divisors (see below), whose sum is σ = 207054730633984. Its totient is φ = 77645523987720.

The previous prime is 135879666978509. The next prime is 135879666978557.

It is a happy number.

135879666978531 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135879666978531 - 2⁹ = 135879666978019 is a prime.

It is a super-2 number, since 2×135879666978531² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135879666978331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3235230166135 + ... + 3235230166176.

It is an arithmetic number, because the mean of its divisors is an integer number (25881841329248).

Almost surely, 2^{135879666978531} is an apocalyptic number.

135879666978531 is a deficient number, since it is larger than the sum of its proper divisors (71175063655453).

135879666978531 is an equidigital number, since it uses as much as digits as its factorization.

135879666978531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6470460332321.

The product of its digits is 12345177600, while the sum is 84.

The spelling of 135879666978531 in words is "one hundred thirty-five trillion, eight hundred seventy-nine billion, six hundred sixty-six million, nine hundred seventy-eight thousand, five hundred thirty-one".