194097780641 has 2 divisors, whose sum is σ = 194097780642. Its totient is φ = 194097780640.

The previous prime is 194097780637. The next prime is 194097780659. The reversal of 194097780641 is 146087790491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175548430225 + 18549350416 = 418985^2 + 136196^2 .

It is a cyclic number.

It is not a de Polignac number, because 194097780641 - 2² = 194097780637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (194097783641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97048890320 + 97048890321.

It is an arithmetic number, because the mean of its divisors is an integer number (97048890321).

Almost surely, 2^194097780641 is an apocalyptic number.

It is an amenable number.

194097780641 is a deficient number, since it is larger than the sum of its proper divisors (1).

194097780641 is an equidigital number, since it uses as much as digits as its factorization.

194097780641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 194097780641 in words is "one hundred ninety-four billion, ninety-seven million, seven hundred eighty thousand, six hundred forty-one".