135121616061 has 4 divisors (see below), whose sum is σ = 180162154752. Its totient is φ = 90081077372.

The previous prime is 135121615973. The next prime is 135121616081. The reversal of 135121616061 is 160616121531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 160616121531 = 3 ⋅53538707177.

It is a cyclic number.

It is not a de Polignac number, because 135121616061 - 2²⁵ = 135088061629 is a prime.

It is a super-2 number, since 2×135121616061² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135121616081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22520269341 + ... + 22520269346.

It is an arithmetic number, because the mean of its divisors is an integer number (45040538688).

Almost surely, 2^135121616061 is an apocalyptic number.

It is an amenable number.

135121616061 is a deficient number, since it is larger than the sum of its proper divisors (45040538691).

135121616061 is an equidigital number, since it uses as much as digits as its factorization.

135121616061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45040538690.

The product of its (nonzero) digits is 6480, while the sum is 33.

Adding to 135121616061 its reverse (160616121531), we get a palindrome (295737737592).

The spelling of 135121616061 in words is "one hundred thirty-five billion, one hundred twenty-one million, six hundred sixteen thousand, sixty-one".