194778560903481 has 15 divisors (see below), whose sum is σ = 290965692194463. Its totient is φ = 129852290197800.

The previous prime is 194778560903461. The next prime is 194778560903501. The reversal of 194778560903481 is 184309065877491.

The square root of 194778560903481 is 13956309.

It is a perfect power (a square), and thus also a powerful number.

194778560903481 is a `hidden beast` number, since 1 + 9 + 4 + 7 + 7 + 8 + 5 + 609 + 0 + 3 + 4 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (194778560903461) and next prime (194778560903501).

It can be written as a sum of positive squares in only one way, i.e., 194439068227881 + 339492675600 = 13944141^2 + 582660^2 .

It is not a de Polignac number, because 194778560903481 - 2²⁹ = 194778024032569 is a prime.

It is a super-2 number, since 2×194778560903481² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (194778560903461) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 124831431 + ... + 126382131.

Almost surely, 2^{194778560903481} is an apocalyptic number.

194778560903481 is the 13956309-th square number.

194778560903481 is the 6978155-th centered octagonal number.

It is an amenable number.

194778560903481 is a deficient number, since it is larger than the sum of its proper divisors (96187131290982).

194778560903481 is an frugal number, since it uses more digits than its factorization.

194778560903481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101414 (or 1550704 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 72.

The spelling of 194778560903481 in words is "one hundred ninety-four trillion, seven hundred seventy-eight billion, five hundred sixty million, nine hundred three thousand, four hundred eighty-one".