136636665438 has 64 divisors (see below), whose sum is σ = 337732319232. Its totient is φ = 35886481920.

The previous prime is 136636665433. The next prime is 136636665443. The reversal of 136636665438 is 834566636631.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (136636665433) and next prime (136636665443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136636665433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387606 + ... + 650777.

It is an arithmetic number, because the mean of its divisors is an integer number (5277067488).

Almost surely, 2^136636665438 is an apocalyptic number.

136636665438 is an abundant number, since it is smaller than the sum of its proper divisors (201095653794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136636665438 is a wasteful number, since it uses less digits than its factorization.

136636665438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038649.

The product of its digits is 33592320, while the sum is 57.

The spelling of 136636665438 in words is "one hundred thirty-six billion, six hundred thirty-six million, six hundred sixty-five thousand, four hundred thirty-eight".