194290091557 has 2 divisors, whose sum is σ = 194290091558. Its totient is φ = 194290091556.

The previous prime is 194290091537. The next prime is 194290091563. The reversal of 194290091557 is 755190092491.

194290091557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189752587236 + 4537504321 = 435606^2 + 67361^2 .

It is a cyclic number.

It is not a de Polignac number, because 194290091557 - 2¹⁵ = 194290058789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194290091507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97145045778 + 97145045779.

It is an arithmetic number, because the mean of its divisors is an integer number (97145045779).

Almost surely, 2^194290091557 is an apocalyptic number.

It is an amenable number.

194290091557 is a deficient number, since it is larger than the sum of its proper divisors (1).

194290091557 is an equidigital number, since it uses as much as digits as its factorization.

194290091557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The spelling of 194290091557 in words is "one hundred ninety-four billion, two hundred ninety million, ninety-one thousand, five hundred fifty-seven".