1025805866 has 8 divisors (see below), whose sum is σ = 1538849664. Its totient is φ = 512855980.

The previous prime is 1025805853. The next prime is 1025805883. The reversal of 1025805866 is 6685085201.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19751 + ... + 49413.

It is an arithmetic number, because the mean of its divisors is an integer number (192356208).

Almost surely, 2^1025805866 is an apocalyptic number.

1025805866 is a deficient number, since it is larger than the sum of its proper divisors (513043798).

1025805866 is a wasteful number, since it uses less digits than its factorization.

1025805866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46956.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 1025805866 is about 32028.2042268998. The cubic root of 1025805866 is about 1008.5290046027.

The spelling of 1025805866 in words is "one billion, twenty-five million, eight hundred five thousand, eight hundred sixty-six".