199117579747 has 16 divisors (see below), whose sum is σ = 206087040000. Its totient is φ = 192292873344.

The previous prime is 199117579711. The next prime is 199117579757. The reversal of 199117579747 is 747975711991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199117579747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199117579757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 820203 + ... + 1034875.

It is an arithmetic number, because the mean of its divisors is an integer number (12880440000).

Almost surely, 2^199117579747 is an apocalyptic number.

199117579747 is a deficient number, since it is larger than the sum of its proper divisors (6969460253).

199117579747 is a wasteful number, since it uses less digits than its factorization.

199117579747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215010.

The product of its digits is 35006580, while the sum is 67.

The spelling of 199117579747 in words is "one hundred ninety-nine billion, one hundred seventeen million, five hundred seventy-nine thousand, seven hundred forty-seven".