1356363661 has 4 divisors (see below), whose sum is σ = 1359332092. Its totient is φ = 1353395232.

The previous prime is 1356363571. The next prime is 1356363689. The reversal of 1356363661 is 1663636531.

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 794958025 + 561405636 = 28195^2 + 23694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356363661 - 2⁹ = 1356363149 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 (1356363361) 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, 1483530 + ... + 1484443.

It is an arithmetic number, because the mean of its divisors is an integer number (339833023).

Almost surely, 2^1356363661 is an apocalyptic number.

It is an amenable number.

1356363661 is a deficient number, since it is larger than the sum of its proper divisors (2968431).

1356363661 is an equidigital number, since it uses as much as digits as its factorization.

1356363661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968430.

The product of its digits is 174960, while the sum is 40.

The square root of 1356363661 is about 36828.8427865987. The cubic root of 1356363661 is about 1106.9433152881.

The spelling of 1356363661 in words is "one billion, three hundred fifty-six million, three hundred sixty-three thousand, six hundred sixty-one".