136666631 has 4 divisors (see below), whose sum is σ = 141075264. Its totient is φ = 132258000.

The previous prime is 136666613. The next prime is 136666669.

136666631 is nontrivially palindromic in base 10.

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 136666631 - 2¹⁴ = 136650247 is a prime.

It is a super-2 number, since 2×136666631² = 37355536057780322, 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 (136666681) 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, 2204270 + ... + 2204331.

It is an arithmetic number, because the mean of its divisors is an integer number (35268816).

Almost surely, 2^136666631 is an apocalyptic number.

136666631 is a deficient number, since it is larger than the sum of its proper divisors (4408633).

136666631 is an equidigital number, since it uses as much as digits as its factorization.

136666631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4408632.

The product of its digits is 69984, while the sum is 38.

The square root of 136666631 is about 11690.4504190386. The cubic root of 136666631 is about 515.0951921313.

The spelling of 136666631 in words is "one hundred thirty-six million, six hundred sixty-six thousand, six hundred thirty-one".