194097780637 has 2 divisors, whose sum is σ = 194097780638. Its totient is φ = 194097780636.

The previous prime is 194097780589. The next prime is 194097780641. The reversal of 194097780637 is 736087790491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186732879876 + 7364900761 = 432126^2 + 85819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194097780637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194097780937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97048890318 + 97048890319.

It is an arithmetic number, because the mean of its divisors is an integer number (97048890319).

Almost surely, 2^194097780637 is an apocalyptic number.

It is an amenable number.

194097780637 is a deficient number, since it is larger than the sum of its proper divisors (1).

194097780637 is an equidigital number, since it uses as much as digits as its factorization.

194097780637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16003008, while the sum is 61.

The spelling of 194097780637 in words is "one hundred ninety-four billion, ninety-seven million, seven hundred eighty thousand, six hundred thirty-seven".