660136420513638 has 24 divisors (see below), whose sum is σ = 1441213864637976. Its totient is φ = 218365737064800.

The previous prime is 660136420513631. The next prime is 660136420513657. The reversal of 660136420513638 is 836315024631066.

660136420513638 is a `hidden beast` number, since 6 + 6 + 0 + 1 + 3 + 64 + 2 + 0 + 513 + 63 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660136420513631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139978034223 + ... + 139978038938.

It is an arithmetic number, because the mean of its divisors is an integer number (60050577693249).

Almost surely, 2^{660136420513638} is an apocalyptic number.

660136420513638 is an abundant number, since it is smaller than the sum of its proper divisors (781077444124338).

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

660136420513638 is a wasteful number, since it uses less digits than its factorization.

660136420513638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279956073300 (or 279956073297 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 54.

The spelling of 660136420513638 in words is "six hundred sixty trillion, one hundred thirty-six billion, four hundred twenty million, five hundred thirteen thousand, six hundred thirty-eight".