199249997761 has 8 divisors (see below), whose sum is σ = 200210774400. Its totient is φ = 198290280720.

The previous prime is 199249997729. The next prime is 199249997801. The reversal of 199249997761 is 167799942991.

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 199249997761 - 2⁵ = 199249997729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199249997861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113391 + ... + 641371.

It is an arithmetic number, because the mean of its divisors is an integer number (25026346800).

Almost surely, 2^199249997761 is an apocalyptic number.

It is an amenable number.

199249997761 is a deficient number, since it is larger than the sum of its proper divisors (960776639).

199249997761 is a wasteful number, since it uses less digits than its factorization.

199249997761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529799.

The product of its digits is 138883248, while the sum is 73.

The spelling of 199249997761 in words is "one hundred ninety-nine billion, two hundred forty-nine million, nine hundred ninety-seven thousand, seven hundred sixty-one".