199709102345 has 8 divisors (see below), whose sum is σ = 242023704840. Its totient is φ = 158185427200.

The previous prime is 199709102273. The next prime is 199709102377. The reversal of 199709102345 is 543201907991.

It can be written as a sum of positive squares in 4 ways, for example, as 88320707344 + 111388395001 = 297188^2 + 333749^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-199709102345 is a prime.

It is a super-3 number, since 3×199709102345³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199709102293 and 199709102302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197731280 + ... + 197732289.

It is an arithmetic number, because the mean of its divisors is an integer number (30252963105).

Almost surely, 2^199709102345 is an apocalyptic number.

It is an amenable number.

199709102345 is a deficient number, since it is larger than the sum of its proper divisors (42314602495).

199709102345 is a wasteful number, since it uses less digits than its factorization.

199709102345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395463675.

The product of its (nonzero) digits is 612360, while the sum is 50.

The spelling of 199709102345 in words is "one hundred ninety-nine billion, seven hundred nine million, one hundred two thousand, three hundred forty-five".