199425658042 has 16 divisors (see below), whose sum is σ = 322176064392. Its totient is φ = 92034918720.

The previous prime is 199425658021. The next prime is 199425658049. The reversal of 199425658042 is 240856524991.

It is a Cunningham number, because it is equal to 446571²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 193431956481 + 5993701561 = 439809^2 + 77419^2 .

It is not an unprimeable number, because it can be changed into a prime (199425658049) 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, 2692 + ... + 631552.

Almost surely, 2^199425658042 is an apocalyptic number.

199425658042 is a deficient number, since it is larger than the sum of its proper divisors (122750406350).

199425658042 is a wasteful number, since it uses less digits than its factorization.

199425658042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641073.

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 199425658042 in words is "one hundred ninety-nine billion, four hundred twenty-five million, six hundred fifty-eight thousand, forty-two".