199981248545 has 16 divisors (see below), whose sum is σ = 258453995520. Its totient is φ = 147668923584.

The previous prime is 199981248497. The next prime is 199981248557. The reversal of 199981248545 is 545842189991.

It is not a de Polignac number, because 199981248545 - 2²² = 199977054241 is a prime.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1009376 + ... + 1191134.

It is an arithmetic number, because the mean of its divisors is an integer number (16153374720).

Almost surely, 2^199981248545 is an apocalyptic number.

It is an amenable number.

199981248545 is a deficient number, since it is larger than the sum of its proper divisors (58472746975).

199981248545 is a wasteful number, since it uses less digits than its factorization.

199981248545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198704.

The product of its digits is 37324800, while the sum is 65.

The spelling of 199981248545 in words is "one hundred ninety-nine billion, nine hundred eighty-one million, two hundred forty-eight thousand, five hundred forty-five".