136660663 has 4 divisors (see below), whose sum is σ = 137347600. Its totient is φ = 135973728.

The previous prime is 136660661. The next prime is 136660703. The reversal of 136660663 is 366066631.

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

It is a cyclic number.

It is not a de Polignac number, because 136660663 - 2¹ = 136660661 is a prime.

It is a super-2 number, since 2×136660663² = 37352273623199138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136660661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343170 + ... + 343567.

It is an arithmetic number, because the mean of its divisors is an integer number (34336900).

Almost surely, 2^136660663 is an apocalyptic number.

136660663 is a deficient number, since it is larger than the sum of its proper divisors (686937).

136660663 is an equidigital number, since it uses as much as digits as its factorization.

136660663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686936.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 136660663 is about 11690.1951651801. The cubic root of 136660663 is about 515.0876942443.

The spelling of 136660663 in words is "one hundred thirty-six million, six hundred sixty thousand, six hundred sixty-three".