204702426405991 has 4 divisors (see below), whose sum is σ = 208171959057000. Its totient is φ = 201232893754984.

The previous prime is 204702426405979. The next prime is 204702426406007. The reversal of 204702426405991 is 199504624207402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204702426405991 - 2⁷ = 204702426405863 is a prime.

It is a super-2 number, since 2×204702426405991² (a number of 29 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 (204702426405791) 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, 1734766325416 + ... + 1734766325533.

It is an arithmetic number, because the mean of its divisors is an integer number (52042989764250).

Almost surely, 2^{204702426405991} is an apocalyptic number.

204702426405991 is a deficient number, since it is larger than the sum of its proper divisors (3469532651009).

204702426405991 is an equidigital number, since it uses as much as digits as its factorization.

204702426405991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3469532651008.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 204702426405991 in words is "two hundred four trillion, seven hundred two billion, four hundred twenty-six million, four hundred five thousand, nine hundred ninety-one".