191063551985478 has 32 divisors (see below), whose sum is σ = 449561298791520. Its totient is φ = 59941506504960.

The previous prime is 191063551985473. The next prime is 191063551985503. The reversal of 191063551985478 is 874589155360191.

It is a happy number.

191063551985478 is a `hidden beast` number, since 1 + 9 + 1 + 0 + 6 + 35 + 519 + 8 + 5 + 4 + 78 = 666.

191063551985478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191063551985473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104065114543 + ... + 104065116378.

It is an arithmetic number, because the mean of its divisors is an integer number (14048790587235).

Almost surely, 2^{191063551985478} is an apocalyptic number.

191063551985478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

191063551985478 is an abundant number, since it is smaller than the sum of its proper divisors (258497746806042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191063551985478 is a wasteful number, since it uses less digits than its factorization.

191063551985478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208130230949 (or 208130230943 counting only the distinct ones).

The product of its (nonzero) digits is 326592000, while the sum is 72.

The spelling of 191063551985478 in words is "one hundred ninety-one trillion, sixty-three billion, five hundred fifty-one million, nine hundred eighty-five thousand, four hundred seventy-eight".