136661545020 has 384 divisors, whose sum is σ = 514502295552. Its totient is φ = 26175513600.

The previous prime is 136661544997. The next prime is 136661545067. The reversal of 136661545020 is 20545166631.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 136661545020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 61920757 + ... + 61922963.

It is an arithmetic number, because the mean of its divisors is an integer number (1339849728).

Almost surely, 2^136661545020 is an apocalyptic number.

136661545020 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 136661545020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257251147776).

136661545020 is an abundant number, since it is smaller than the sum of its proper divisors (377840750532).

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

136661545020 is a wasteful number, since it uses less digits than its factorization.

136661545020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281 (or 3279 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 136661545020 in words is "one hundred thirty-six billion, six hundred sixty-one million, five hundred forty-five thousand, twenty".