194290091563 has 2 divisors, whose sum is σ = 194290091564. Its totient is φ = 194290091562.

The previous prime is 194290091557. The next prime is 194290091581. The reversal of 194290091563 is 365190092491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194290091563 - 2¹³ = 194290083371 is a prime.

It is not a weakly prime, because it can be changed into another prime (194290091063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97145045781 + 97145045782.

It is an arithmetic number, because the mean of its divisors is an integer number (97145045782).

Almost surely, 2^194290091563 is an apocalyptic number.

194290091563 is a deficient number, since it is larger than the sum of its proper divisors (1).

194290091563 is an equidigital number, since it uses as much as digits as its factorization.

194290091563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 49.

The spelling of 194290091563 in words is "one hundred ninety-four billion, two hundred ninety million, ninety-one thousand, five hundred sixty-three".