42639251426 has 4 divisors (see below), whose sum is σ = 63958877142. Its totient is φ = 21319625712.

The previous prime is 42639251423. The next prime is 42639251449. The reversal of 42639251426 is 62415293624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 36311208025 + 6328043401 = 190555^2 + 79549^2 .

It is not an unprimeable number, because it can be changed into a prime (42639251423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10659812855 + ... + 10659812858.

Almost surely, 2^42639251426 is an apocalyptic number.

42639251426 is a deficient number, since it is larger than the sum of its proper divisors (21319625716).

42639251426 is a wasteful number, since it uses less digits than its factorization.

42639251426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21319625715.

The product of its digits is 622080, while the sum is 44.

The spelling of 42639251426 in words is "forty-two billion, six hundred thirty-nine million, two hundred fifty-one thousand, four hundred twenty-six".