196781644345653 has 40 divisors (see below), whose sum is σ = 295320484166400. Its totient is φ = 130579784672832.

The previous prime is 196781644345631. The next prime is 196781644345697. The reversal of 196781644345653 is 356543446187691.

196781644345653 is a `hidden beast` number, since 1 + 9 + 6 + 7 + 8 + 16 + 4 + 43 + 4 + 565 + 3 = 666.

It is not a de Polignac number, because 196781644345653 - 2²⁴ = 196781627568437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196781644345453) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 119463513 + ... + 121099521.

It is an arithmetic number, because the mean of its divisors is an integer number (7383012104160).

Almost surely, 2^{196781644345653} is an apocalyptic number.

It is an amenable number.

196781644345653 is a deficient number, since it is larger than the sum of its proper divisors (98538839820747).

196781644345653 is a wasteful number, since it uses less digits than its factorization.

196781644345653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642903 (or 1642894 counting only the distinct ones).

The product of its digits is 1567641600, while the sum is 72.

The spelling of 196781644345653 in words is "one hundred ninety-six trillion, seven hundred eighty-one billion, six hundred forty-four million, three hundred forty-five thousand, six hundred fifty-three".