42138370664 has 24 divisors (see below), whose sum is σ = 85091321910. Its totient is φ = 19447512576.

The previous prime is 42138370591. The next prime is 42138370669. The reversal of 42138370664 is 46607383124.

It can be written as a sum of positive squares in 3 ways, for example, as 41448888100 + 689482564 = 203590^2 + 26258^2 .

It is not an unprimeable number, because it can be changed into a prime (42138370669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2083352 + ... + 2103480.

Almost surely, 2^42138370664 is an apocalyptic number.

It is an amenable number.

42138370664 is an abundant number, since it is smaller than the sum of its proper divisors (42952951246).

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

42138370664 is an frugal number, since it uses more digits than its factorization.

42138370664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40277 (or 20144 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 42138370664 in words is "forty-two billion, one hundred thirty-eight million, three hundred seventy thousand, six hundred sixty-four".