667232838738 has 96 divisors (see below), whose sum is σ = 1609453974960. Its totient is φ = 198796308480.

The previous prime is 667232838697. The next prime is 667232838739. The reversal of 667232838738 is 837838232766.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 237477858489 + 429754980249 = 487317^2 + 655557^2 .

It is a super-2 number, since 2×667232838738² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667232838739) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74995 + ... + 1157622.

Almost surely, 2^667232838738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667232838738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804726987480).

667232838738 is an abundant number, since it is smaller than the sum of its proper divisors (942221136222).

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

667232838738 is a wasteful number, since it uses less digits than its factorization.

667232838738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232732 (or 1232729 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 63.

The spelling of 667232838738 in words is "six hundred sixty-seven billion, two hundred thirty-two million, eight hundred thirty-eight thousand, seven hundred thirty-eight".