1191276664 has 16 divisors (see below), whose sum is σ = 2281168800. Its totient is φ = 582964992.

The previous prime is 1191276661. The next prime is 1191276677. The reversal of 1191276664 is 4666721911.

It is a self number, because there is not a number n which added to its sum of digits gives 1191276664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191276661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1583769 + ... + 1584520.

It is an arithmetic number, because the mean of its divisors is an integer number (142573050).

Almost surely, 2^1191276664 is an apocalyptic number.

It is an amenable number.

1191276664 is a deficient number, since it is larger than the sum of its proper divisors (1089892136).

1191276664 is a wasteful number, since it uses less digits than its factorization.

1191276664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168342 (or 3168338 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 1191276664 is about 34514.8759812345. The cubic root of 1191276664 is about 1060.0773243699.

The spelling of 1191276664 in words is "one billion, one hundred ninety-one million, two hundred seventy-six thousand, six hundred sixty-four".