194450625687 has 4 divisors (see below), whose sum is σ = 259267500920. Its totient is φ = 129633750456.

The previous prime is 194450625653. The next prime is 194450625701. The reversal of 194450625687 is 786526054491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786526054491 = 3 ⋅262175351497.

It is not a de Polignac number, because 194450625687 - 2¹² = 194450621591 is a prime.

It is a super-2 number, since 2×194450625687² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194450625647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32408437612 + ... + 32408437617.

It is an arithmetic number, because the mean of its divisors is an integer number (64816875230).

Almost surely, 2^194450625687 is an apocalyptic number.

194450625687 is a deficient number, since it is larger than the sum of its proper divisors (64816875233).

194450625687 is an equidigital number, since it uses as much as digits as its factorization.

194450625687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64816875232.

The product of its (nonzero) digits is 14515200, while the sum is 57.

The spelling of 194450625687 in words is "one hundred ninety-four billion, four hundred fifty million, six hundred twenty-five thousand, six hundred eighty-seven".