42019251890557 has 8 divisors (see below), whose sum is σ = 42025028455800. Its totient is φ = 42013475733504.

The previous prime is 42019251890509. The next prime is 42019251890657. The reversal of 42019251890557 is 75509815291024.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20618737497796 + 21400514392761 = 4540786^2 + 4626069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42019251890557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42019251890507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244329963 + ... + 244501879.

It is an arithmetic number, because the mean of its divisors is an integer number (5253128556975).

Almost surely, 2^{42019251890557} is an apocalyptic number.

It is an amenable number.

42019251890557 is a deficient number, since it is larger than the sum of its proper divisors (5776565243).

42019251890557 is a wasteful number, since it uses less digits than its factorization.

42019251890557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204095.

The product of its (nonzero) digits is 9072000, while the sum is 58.

The spelling of 42019251890557 in words is "forty-two trillion, nineteen billion, two hundred fifty-one million, eight hundred ninety thousand, five hundred fifty-seven".