1156642916566 has 4 divisors (see below), whose sum is σ = 1734964374852. Its totient is φ = 578321458282.

The previous prime is 1156642916549. The next prime is 1156642916573. The reversal of 1156642916566 is 6656192466511.

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

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1156642916566.

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, 289160729140 + ... + 289160729143.

It is an arithmetic number, because the mean of its divisors is an integer number (433741093713).

Almost surely, 2^{1156642916566} is an apocalyptic number.

1156642916566 is a deficient number, since it is larger than the sum of its proper divisors (578321458286).

1156642916566 is an equidigital number, since it uses as much as digits as its factorization.

1156642916566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578321458285.

The product of its digits is 13996800, while the sum is 58.

The spelling of 1156642916566 in words is "one trillion, one hundred fifty-six billion, six hundred forty-two million, nine hundred sixteen thousand, five hundred sixty-six".