185428416997 has 8 divisors (see below), whose sum is σ = 201124653912. Its totient is φ = 170264256000.

The previous prime is 185428416989. The next prime is 185428417019. The reversal of 185428416997 is 799614824581.

185428416997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 430614²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 185428416996 = 1^2 + 430614^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 185428416997 - 2³ = 185428416989 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 (185428416917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133018254 + ... + 133019647.

It is an arithmetic number, because the mean of its divisors is an integer number (25140581739).

Almost surely, 2^185428416997 is an apocalyptic number.

185428416997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

185428416997 is a deficient number, since it is larger than the sum of its proper divisors (15696236915).

185428416997 is a wasteful number, since it uses less digits than its factorization.

185428416997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266037959.

The product of its digits is 34836480, while the sum is 64.

The spelling of 185428416997 in words is "one hundred eighty-five billion, four hundred twenty-eight million, four hundred sixteen thousand, nine hundred ninety-seven".