1155615666 has 32 divisors (see below), whose sum is σ = 2326910976. Its totient is φ = 382602000.

The previous prime is 1155615653. The next prime is 1155615689. The reversal of 1155615666 is 6665165511.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616711 + ... + 618581.

It is an arithmetic number, because the mean of its divisors is an integer number (72715968).

Almost surely, 2^1155615666 is an apocalyptic number.

1155615666 is an abundant number, since it is smaller than the sum of its proper divisors (1171295310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155615666 is a wasteful number, since it uses less digits than its factorization.

1155615666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518.

The product of its digits is 162000, while the sum is 42.

The square root of 1155615666 is about 33994.3475595576. The cubic root of 1155615666 is about 1049.3921397788.

The spelling of 1155615666 in words is "one billion, one hundred fifty-five million, six hundred fifteen thousand, six hundred sixty-six".