136909871640 has 192 divisors, whose sum is σ = 452675714400. Its totient is φ = 35878588416.

The previous prime is 136909871627. The next prime is 136909871687. The reversal of 136909871640 is 46178909631.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10437406 + ... + 10450514.

Almost surely, 2^136909871640 is an apocalyptic number.

136909871640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 136909871640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226337857200).

136909871640 is an abundant number, since it is smaller than the sum of its proper divisors (315765842760).

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

136909871640 is a wasteful number, since it uses less digits than its factorization.

136909871640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13626 (or 13619 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 136909871640 in words is "one hundred thirty-six billion, nine hundred nine million, eight hundred seventy-one thousand, six hundred forty".