1288425566 has 4 divisors (see below), whose sum is σ = 1932638352. Its totient is φ = 644212782.

The previous prime is 1288425557. The next prime is 1288425571. The reversal of 1288425566 is 6655248821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1288425566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322106390 + ... + 322106393.

It is an arithmetic number, because the mean of its divisors is an integer number (483159588).

Almost surely, 2^1288425566 is an apocalyptic number.

1288425566 is a deficient number, since it is larger than the sum of its proper divisors (644212786).

1288425566 is an equidigital number, since it uses as much as digits as its factorization.

1288425566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644212785.

The product of its digits is 921600, while the sum is 47.

The square root of 1288425566 is about 35894.6453666839. The cubic root of 1288425566 is about 1088.1441826788.

The spelling of 1288425566 in words is "one billion, two hundred eighty-eight million, four hundred twenty-five thousand, five hundred sixty-six".