135661364525 has 6 divisors (see below), whose sum is σ = 168220092042. Its totient is φ = 108529091600.

The previous prime is 135661364507. The next prime is 135661364543. The reversal of 135661364525 is 525463166531.

It is an interprime number because it is at equal distance from previous prime (135661364507) and next prime (135661364543).

It can be written as a sum of positive squares in 3 ways, for example, as 162282121 + 135499082404 = 12739^2 + 368102^2 .

It is not a de Polignac number, because 135661364525 - 2¹⁰ = 135661363501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135661364525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2713227266 + ... + 2713227315.

It is an arithmetic number, because the mean of its divisors is an integer number (28036682007).

Almost surely, 2^135661364525 is an apocalyptic number.

It is an amenable number.

135661364525 is a deficient number, since it is larger than the sum of its proper divisors (32558727517).

135661364525 is an equidigital number, since it uses as much as digits as its factorization.

135661364525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426454591 (or 5426454586 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 47.

The spelling of 135661364525 in words is "one hundred thirty-five billion, six hundred sixty-one million, three hundred sixty-four thousand, five hundred twenty-five".