1285903438666 has 96 divisors (see below), whose sum is σ = 2505454346880. Its totient is φ = 484833254400.

The previous prime is 1285903438663. The next prime is 1285903438691. The reversal of 1285903438666 is 6668343095821.

It is not an unprimeable number, because it can be changed into a prime (1285903438663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17871370 + ... + 17943178.

It is an arithmetic number, because the mean of its divisors is an integer number (26098482780).

Almost surely, 2^{1285903438666} is an apocalyptic number.

1285903438666 is a deficient number, since it is larger than the sum of its proper divisors (1219550908214).

1285903438666 is an equidigital number, since it uses as much as digits as its factorization.

1285903438666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71913 (or 71860 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 61.

The spelling of 1285903438666 in words is "one trillion, two hundred eighty-five billion, nine hundred three million, four hundred thirty-eight thousand, six hundred sixty-six".