42071494251 has 4 divisors (see below), whose sum is σ = 56095325672. Its totient is φ = 28047662832.

The previous prime is 42071494237. The next prime is 42071494253. The reversal of 42071494251 is 15249417024.

42071494251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 42071494251 - 2⁶ = 42071494187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42071494253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7011915706 + ... + 7011915711.

It is an arithmetic number, because the mean of its divisors is an integer number (14023831418).

Almost surely, 2^42071494251 is an apocalyptic number.

42071494251 is a deficient number, since it is larger than the sum of its proper divisors (14023831421).

42071494251 is a wasteful number, since it uses less digits than its factorization.

42071494251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14023831420.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 42071494251 in words is "forty-two billion, seventy-one million, four hundred ninety-four thousand, two hundred fifty-one".