194431739867557 has 2 divisors, whose sum is σ = 194431739867558. Its totient is φ = 194431739867556.

The previous prime is 194431739867527. The next prime is 194431739867567. The reversal of 194431739867557 is 755768937134491.

194431739867557 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., 191346328174401 + 3085411693156 = 13832799^2 + 1756534^2 .

It is a cyclic number.

It is not a de Polignac number, because 194431739867557 - 2¹⁹ = 194431739343269 is a prime.

It is a super-2 number, since 2×194431739867557² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194431739867527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97215869933778 + 97215869933779.

It is an arithmetic number, because the mean of its divisors is an integer number (97215869933779).

Almost surely, 2^{194431739867557} is an apocalyptic number.

It is an amenable number.

194431739867557 is a deficient number, since it is larger than the sum of its proper divisors (1).

194431739867557 is an equidigital number, since it uses as much as digits as its factorization.

194431739867557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800902400, while the sum is 79.

The spelling of 194431739867557 in words is "one hundred ninety-four trillion, four hundred thirty-one billion, seven hundred thirty-nine million, eight hundred sixty-seven thousand, five hundred fifty-seven".