1156641646 has 4 divisors (see below), whose sum is σ = 1734962472. Its totient is φ = 578320822.

The previous prime is 1156641601. The next prime is 1156641653. The reversal of 1156641646 is 6461466511.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1156641599 and 1156641608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 289160410 + ... + 289160413.

It is an arithmetic number, because the mean of its divisors is an integer number (433740618).

Almost surely, 2^1156641646 is an apocalyptic number.

1156641646 is a deficient number, since it is larger than the sum of its proper divisors (578320826).

1156641646 is an equidigital number, since it uses as much as digits as its factorization.

1156641646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578320825.

The product of its digits is 103680, while the sum is 40.

The square root of 1156641646 is about 34009.4346615759. The cubic root of 1156641646 is about 1049.7026054208.

The spelling of 1156641646 in words is "one billion, one hundred fifty-six million, six hundred forty-one thousand, six hundred forty-six".