191061015603 has 16 divisors (see below), whose sum is σ = 255547769856. Its totient is φ = 126974675520.

The previous prime is 191061015569. The next prime is 191061015631. The reversal of 191061015603 is 306510160191.

It is not a de Polignac number, because 191061015603 - 2⁹ = 191061015091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191061015653) 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, 1365351 + ... + 1498767.

It is an arithmetic number, because the mean of its divisors is an integer number (15971735616).

Almost surely, 2^191061015603 is an apocalyptic number.

191061015603 is a deficient number, since it is larger than the sum of its proper divisors (64486754253).

191061015603 is a wasteful number, since it uses less digits than its factorization.

191061015603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134914.

The product of its (nonzero) digits is 4860, while the sum is 33.

Adding to 191061015603 its reverse (306510160191), we get a palindrome (497571175794).

The spelling of 191061015603 in words is "one hundred ninety-one billion, sixty-one million, fifteen thousand, six hundred three".