136661560 has 64 divisors (see below), whose sum is σ = 358084800. Its totient is φ = 45966336.

The previous prime is 136661557. The next prime is 136661573. The reversal of 136661560 is 65166631.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10236 + ... + 19444.

It is an arithmetic number, because the mean of its divisors is an integer number (5595075).

Almost surely, 2^136661560 is an apocalyptic number.

136661560 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 136661560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179042400).

136661560 is an abundant number, since it is smaller than the sum of its proper divisors (221423240).

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

136661560 is a wasteful number, since it uses less digits than its factorization.

136661560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9280 (or 9276 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 136661560 is about 11690.2335306015. The cubic root of 136661560 is about 515.0888212027.

It can be divided in two parts, 1366 and 61560, that added together give a palindrome (62926).

The spelling of 136661560 in words is "one hundred thirty-six million, six hundred sixty-one thousand, five hundred sixty".