42697042638 has 16 divisors (see below), whose sum is σ = 85905429120. Its totient is φ = 14147123576.

The previous prime is 42697042621. The next prime is 42697042639. The reversal of 42697042638 is 83624079624.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42697042639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21304908 + ... + 21306911.

It is an arithmetic number, because the mean of its divisors is an integer number (5369089320).

Almost surely, 2^42697042638 is an apocalyptic number.

42697042638 is an abundant number, since it is smaller than the sum of its proper divisors (43208386482).

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

42697042638 is a wasteful number, since it uses less digits than its factorization.

42697042638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42611991.

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 42697042638 in words is "forty-two billion, six hundred ninety-seven million, forty-two thousand, six hundred thirty-eight".