136405666 has 16 divisors (see below), whose sum is σ = 207648000. Its totient is φ = 67193568.

The previous prime is 136405657. The next prime is 136405667. The reversal of 136405666 is 666504631.

It is not an unprimeable number, because it can be changed into a prime (136405667) 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, 129510 + ... + 130558.

It is an arithmetic number, because the mean of its divisors is an integer number (12978000).

Almost surely, 2^136405666 is an apocalyptic number.

136405666 is a deficient number, since it is larger than the sum of its proper divisors (71242334).

136405666 is a wasteful number, since it uses less digits than its factorization.

136405666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 136405666 is about 11679.2836252914. The cubic root of 136405666 is about 514.7671250525.

It can be divided in two parts, 13640 and 5666, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 136405666 in words is "one hundred thirty-six million, four hundred five thousand, six hundred sixty-six".