1320666245 has 4 divisors (see below), whose sum is σ = 1584799500. Its totient is φ = 1056532992.

The previous prime is 1320666239. The next prime is 1320666323. The reversal of 1320666245 is 5426660231.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 772450849 + 548215396 = 27793^2 + 23414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320666245 - 2¹² = 1320662149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132066620 + ... + 132066629.

It is an arithmetic number, because the mean of its divisors is an integer number (396199875).

Almost surely, 2^1320666245 is an apocalyptic number.

It is an amenable number.

1320666245 is a deficient number, since it is larger than the sum of its proper divisors (264133255).

1320666245 is an equidigital number, since it uses as much as digits as its factorization.

1320666245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264133254.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 1320666245 is about 36340.9719875515. The cubic root of 1320666245 is about 1097.1458362599.

The spelling of 1320666245 in words is "one billion, three hundred twenty million, six hundred sixty-six thousand, two hundred forty-five".