194467553261 has 2 divisors, whose sum is σ = 194467553262. Its totient is φ = 194467553260.

The previous prime is 194467553251. The next prime is 194467553309. The reversal of 194467553261 is 162355764491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151920652900 + 42546900361 = 389770^2 + 206269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194467553261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194467553251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97233776630 + 97233776631.

It is an arithmetic number, because the mean of its divisors is an integer number (97233776631).

Almost surely, 2^194467553261 is an apocalyptic number.

It is an amenable number.

194467553261 is a deficient number, since it is larger than the sum of its proper divisors (1).

194467553261 is an equidigital number, since it uses as much as digits as its factorization.

194467553261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 53.

The spelling of 194467553261 in words is "one hundred ninety-four billion, four hundred sixty-seven million, five hundred fifty-three thousand, two hundred sixty-one".