42051428857 has 4 divisors (see below), whose sum is σ = 42053120356. Its totient is φ = 42049737360.

The previous prime is 42051428833. The next prime is 42051428863. The reversal of 42051428857 is 75882415024.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34808738041 + 7242690816 = 186571^2 + 85104^2 .

It is a cyclic number.

It is not a de Polignac number, because 42051428857 - 2¹⁹ = 42050904569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42051428807) 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, 807894 + ... + 858367.

It is an arithmetic number, because the mean of its divisors is an integer number (10513280089).

Almost surely, 2^42051428857 is an apocalyptic number.

It is an amenable number.

42051428857 is a deficient number, since it is larger than the sum of its proper divisors (1691499).

42051428857 is a wasteful number, since it uses less digits than its factorization.

42051428857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691498.

The product of its (nonzero) digits is 716800, while the sum is 46.

The spelling of 42051428857 in words is "forty-two billion, fifty-one million, four hundred twenty-eight thousand, eight hundred fifty-seven".