136521857766 has 128 divisors (see below), whose sum is σ = 323728441344. Its totient is φ = 37577554560.

The previous prime is 136521857753. The next prime is 136521857779. The reversal of 136521857766 is 667758125631.

It is an interprime number because it is at equal distance from previous prime (136521857753) and next prime (136521857779).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32839360 + ... + 32843516.

It is an arithmetic number, because the mean of its divisors is an integer number (2529128448).

Almost surely, 2^136521857766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 136521857766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161864220672).

136521857766 is an abundant number, since it is smaller than the sum of its proper divisors (187206583578).

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

136521857766 is a wasteful number, since it uses less digits than its factorization.

136521857766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4474.

The product of its digits is 12700800, while the sum is 57.

The spelling of 136521857766 in words is "one hundred thirty-six billion, five hundred twenty-one million, eight hundred fifty-seven thousand, seven hundred sixty-six".