194358517489 has 4 divisors (see below), whose sum is σ = 198878483056. Its totient is φ = 189838551924.

The previous prime is 194358517459. The next prime is 194358517513. The reversal of 194358517489 is 984715853491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 194358517489 - 2²¹ = 194356420337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194358517489.

It is not an unprimeable number, because it can be changed into a prime (194358517459) 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, 2259982719 + ... + 2259982804.

It is an arithmetic number, because the mean of its divisors is an integer number (49719620764).

Almost surely, 2^194358517489 is an apocalyptic number.

It is an amenable number.

194358517489 is a deficient number, since it is larger than the sum of its proper divisors (4519965567).

194358517489 is an equidigital number, since it uses as much as digits as its factorization.

194358517489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519965566.

The product of its digits is 43545600, while the sum is 64.

The spelling of 194358517489 in words is "one hundred ninety-four billion, three hundred fifty-eight million, five hundred seventeen thousand, four hundred eighty-nine".