660729531738 has 16 divisors (see below), whose sum is σ = 1321467035616. Its totient is φ = 220241848560.

The previous prime is 660729531733. The next prime is 660729531739. The reversal of 660729531738 is 837135927066.

660729531738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×660729531738² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (660729531733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1731273 + ... + 2078163.

It is an arithmetic number, because the mean of its divisors is an integer number (82591689726).

Almost surely, 2^660729531738 is an apocalyptic number.

660729531738 is an abundant number, since it is smaller than the sum of its proper divisors (660737503878).

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

660729531738 is a wasteful number, since it uses less digits than its factorization.

660729531738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664349.

The product of its (nonzero) digits is 11430720, while the sum is 57.

The spelling of 660729531738 in words is "six hundred sixty billion, seven hundred twenty-nine million, five hundred thirty-one thousand, seven hundred thirty-eight".