204691991534 has 8 divisors (see below), whose sum is σ = 307047567648. Its totient is φ = 102342802320.

The previous prime is 204691991533. The next prime is 204691991557. The reversal of 204691991534 is 435199196402.

204691991534 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×204691991534² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204691991533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515782 + ... + 1645289.

It is an arithmetic number, because the mean of its divisors is an integer number (38380945956).

Almost surely, 2^204691991534 is an apocalyptic number.

204691991534 is a deficient number, since it is larger than the sum of its proper divisors (102355576114).

204691991534 is a wasteful number, since it uses less digits than its factorization.

204691991534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3193450.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 204691991534 in words is "two hundred four billion, six hundred ninety-one million, nine hundred ninety-one thousand, five hundred thirty-four".