136555661 has 8 divisors (see below), whose sum is σ = 149590848. Its totient is φ = 123624000.

The previous prime is 136555619. The next prime is 136555681. The reversal of 136555661 is 166555631.

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

It is a cyclic number.

It is not a de Polignac number, because 136555661 - 2⁶ = 136555597 is a prime.

It is a super-2 number, since 2×136555661² = 37294897102293842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136555681) 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, 23105 + ... + 28406.

It is an arithmetic number, because the mean of its divisors is an integer number (18698856).

Almost surely, 2^136555661 is an apocalyptic number.

136555661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136555661 is a deficient number, since it is larger than the sum of its proper divisors (13035187).

136555661 is a wasteful number, since it uses less digits than its factorization.

136555661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51763.

The product of its digits is 81000, while the sum is 38.

The square root of 136555661 is about 11685.7032736588. The cubic root of 136555661 is about 514.9557394331.

The spelling of 136555661 in words is "one hundred thirty-six million, five hundred fifty-five thousand, six hundred sixty-one".