191018566453 has 16 divisors (see below), whose sum is σ = 224488164096. Its totient is φ = 160241912640.

The previous prime is 191018566433. The next prime is 191018566457. The reversal of 191018566453 is 354665810191.

It is a cyclic number.

It is not a de Polignac number, because 191018566453 - 2¹⁷ = 191018435381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191018566397 and 191018566406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191018566457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211351 + ... + 653227.

It is an arithmetic number, because the mean of its divisors is an integer number (14030510256).

Almost surely, 2^191018566453 is an apocalyptic number.

191018566453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

191018566453 is a deficient number, since it is larger than the sum of its proper divisors (33469597643).

191018566453 is a wasteful number, since it uses less digits than its factorization.

191018566453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444924.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 191018566453 in words is "one hundred ninety-one billion, eighteen million, five hundred sixty-six thousand, four hundred fifty-three".