204893635781 has 8 divisors (see below), whose sum is σ = 213922008960. Its totient is φ = 195875258832.

The previous prime is 204893635763. The next prime is 204893635819. The reversal of 204893635781 is 187536398402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204893635781 is a prime.

It is a super-2 number, since 2×204893635781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204893635741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2457146 + ... + 2539163.

It is an arithmetic number, because the mean of its divisors is an integer number (26740251120).

It is a 1-persistent number, because it is pandigital, but 2⋅204893635781 = 409787271562 is not.

Almost surely, 2^204893635781 is an apocalyptic number.

It is an amenable number.

204893635781 is a deficient number, since it is larger than the sum of its proper divisors (9028373179).

204893635781 is a wasteful number, since it uses less digits than its factorization.

204893635781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4998115.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 204893635781 in words is "two hundred four billion, eight hundred ninety-three million, six hundred thirty-five thousand, seven hundred eighty-one".