191464645545 has 12 divisors (see below), whose sum is σ = 331872052356. Its totient is φ = 102114477600.

The previous prime is 191464645543. The next prime is 191464645651. The reversal of 191464645545 is 545546464191.

191464645545 is a `hidden beast` number, since 1 + 9 + 1 + 46 + 46 + 4 + 554 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27089538921 + 164375106624 = 164589^2 + 405432^2 .

It is not a de Polignac number, because 191464645545 - 2¹ = 191464645543 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 191464645491 and 191464645500.

It is not an unprimeable number, because it can be changed into a prime (191464645543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2127384906 + ... + 2127384995.

It is an arithmetic number, because the mean of its divisors is an integer number (27656004363).

Almost surely, 2^191464645545 is an apocalyptic number.

191464645545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191464645545 is a deficient number, since it is larger than the sum of its proper divisors (140407406811).

191464645545 is a wasteful number, since it uses less digits than its factorization.

191464645545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254769912 (or 4254769909 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 54.

The spelling of 191464645545 in words is "one hundred ninety-one billion, four hundred sixty-four million, six hundred forty-five thousand, five hundred forty-five".