135121606461 has 20 divisors (see below), whose sum is σ = 201972584352. Its totient is φ = 90025616808.

The previous prime is 135121606429. The next prime is 135121606537. The reversal of 135121606461 is 164606121531.

135121606461 is a `hidden beast` number, since 1 + 3 + 5 + 1 + 2 + 1 + 6 + 0 + 646 + 1 = 666.

It is not a de Polignac number, because 135121606461 - 2⁵ = 135121606429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135121606661) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 380865 + ... + 644438.

Almost surely, 2^135121606461 is an apocalyptic number.

It is an amenable number.

135121606461 is a deficient number, since it is larger than the sum of its proper divisors (66850977891).

135121606461 is a wasteful number, since it uses less digits than its factorization.

135121606461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026942 (or 1026933 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 135121606461 its reverse (164606121531), we get a palindrome (299727727992).

The spelling of 135121606461 in words is "one hundred thirty-five billion, one hundred twenty-one million, six hundred six thousand, four hundred sixty-one".