205871488947 has 8 divisors (see below), whose sum is σ = 304994798480. Its totient is φ = 137247659280.

The previous prime is 205871488939. The next prime is 205871488957. The reversal of 205871488947 is 749884178502.

205871488947 is a `hidden beast` number, since 2 + 0 + 587 + 1 + 4 + 8 + 8 + 9 + 47 = 666.

It is not a de Polignac number, because 205871488947 - 2³ = 205871488939 is a prime.

It is a super-2 number, since 2×205871488947² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205871488957) 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, 3812434954 + ... + 3812435007.

It is an arithmetic number, because the mean of its divisors is an integer number (38124349810).

Almost surely, 2^205871488947 is an apocalyptic number.

205871488947 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

205871488947 is a deficient number, since it is larger than the sum of its proper divisors (99123309533).

205871488947 is an equidigital number, since it uses as much as digits as its factorization.

205871488947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7624869970 (or 7624869964 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 63.

The spelling of 205871488947 in words is "two hundred five billion, eight hundred seventy-one million, four hundred eighty-eight thousand, nine hundred forty-seven".