1355666791 has 4 divisors (see below), whose sum is σ = 1392306472. Its totient is φ = 1319027112.

The previous prime is 1355666783. The next prime is 1355666801. The reversal of 1355666791 is 1976665531.

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

It is a cyclic number.

It is not a de Polignac number, because 1355666791 - 2³ = 1355666783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355666761) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 18319785 + ... + 18319858.

It is an arithmetic number, because the mean of its divisors is an integer number (348076618).

Almost surely, 2^1355666791 is an apocalyptic number.

1355666791 is a deficient number, since it is larger than the sum of its proper divisors (36639681).

1355666791 is an equidigital number, since it uses as much as digits as its factorization.

1355666791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36639680.

The product of its digits is 1020600, while the sum is 49.

The square root of 1355666791 is about 36819.3806438946. The cubic root of 1355666791 is about 1106.7537083862.

The spelling of 1355666791 in words is "one billion, three hundred fifty-five million, six hundred sixty-six thousand, seven hundred ninety-one".