135420462540661 has 4 divisors (see below), whose sum is σ = 135427110921900. Its totient is φ = 135413814159424.

The previous prime is 135420462540647. The next prime is 135420462540673. The reversal of 135420462540661 is 166045264024531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109960516274436 + 25459946266225 = 10486206^2 + 5045785^2 .

It is a cyclic number.

It is not a de Polignac number, because 135420462540661 - 2²¹ = 135420460443509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135420462540641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3324160066 + ... + 3324200803.

It is an arithmetic number, because the mean of its divisors is an integer number (33856777730475).

Almost surely, 2^{135420462540661} is an apocalyptic number.

It is an amenable number.

135420462540661 is a deficient number, since it is larger than the sum of its proper divisors (6648381239).

135420462540661 is an equidigital number, since it uses as much as digits as its factorization.

135420462540661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6648381238.

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 135420462540661 in words is "one hundred thirty-five trillion, four hundred twenty billion, four hundred sixty-two million, five hundred forty thousand, six hundred sixty-one".