1097788666 has 16 divisors (see below), whose sum is σ = 1850454144. Its totient is φ = 484642224.

The previous prime is 1097788619. The next prime is 1097788733. The reversal of 1097788666 is 6668877901.

It is a self number, because there is not a number n which added to its sum of digits gives 1097788666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 917286 + ... + 918481.

It is an arithmetic number, because the mean of its divisors is an integer number (115653384).

Almost surely, 2^1097788666 is an apocalyptic number.

1097788666 is a deficient number, since it is larger than the sum of its proper divisors (752665478).

1097788666 is a wasteful number, since it uses less digits than its factorization.

1097788666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835805.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The square root of 1097788666 is about 33132.8940178790. The cubic root of 1097788666 is about 1031.5879192508.

The spelling of 1097788666 in words is "one billion, ninety-seven million, seven hundred eighty-eight thousand, six hundred sixty-six".