196720645849 has 64 divisors (see below), whose sum is σ = 259841627136. Its totient is φ = 144512999424.

The previous prime is 196720645799. The next prime is 196720645931. The reversal of 196720645849 is 948546027691.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-196720645849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (196720643849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44135229 + ... + 44139685.

It is an arithmetic number, because the mean of its divisors is an integer number (4060025424).

Almost surely, 2^196720645849 is an apocalyptic number.

It is an amenable number.

196720645849 is a deficient number, since it is larger than the sum of its proper divisors (63120981287).

196720645849 is a wasteful number, since it uses less digits than its factorization.

196720645849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874.

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 196720645849 in words is "one hundred ninety-six billion, seven hundred twenty million, six hundred forty-five thousand, eight hundred forty-nine".