194889356807 has 2 divisors, whose sum is σ = 194889356808. Its totient is φ = 194889356806.

The previous prime is 194889356803. The next prime is 194889356833. The reversal of 194889356807 is 708653988491.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194889356807 - 2² = 194889356803 is a prime.

It is a super-2 number, since 2×194889356807² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194889356801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97444678403 + 97444678404.

It is an arithmetic number, because the mean of its divisors is an integer number (97444678404).

Almost surely, 2^194889356807 is an apocalyptic number.

194889356807 is a deficient number, since it is larger than the sum of its proper divisors (1).

194889356807 is an equidigital number, since it uses as much as digits as its factorization.

194889356807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104509440, while the sum is 68.

The spelling of 194889356807 in words is "one hundred ninety-four billion, eight hundred eighty-nine million, three hundred fifty-six thousand, eight hundred seven".