1323455661 has 48 divisors (see below), whose sum is σ = 2227979520. Its totient is φ = 748124160.

The previous prime is 1323455647. The next prime is 1323455699. The reversal of 1323455661 is 1665543231.

1323455661 is a `hidden beast` number, since 13 + 2 + 34 + 556 + 61 = 666.

It is not a de Polignac number, because 1323455661 - 2⁷ = 1323455533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323455641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186700 + ... + 193658.

It is an arithmetic number, because the mean of its divisors is an integer number (46416240).

Almost surely, 2^1323455661 is an apocalyptic number.

1323455661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1323455661 is a deficient number, since it is larger than the sum of its proper divisors (904523859).

1323455661 is a wasteful number, since it uses less digits than its factorization.

1323455661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7106 (or 7103 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 1323455661 is about 36379.3301340198. The cubic root of 1323455661 is about 1097.9177305057.

Adding to 1323455661 its reverse (1665543231), we get a palindrome (2988998892).

The spelling of 1323455661 in words is "one billion, three hundred twenty-three million, four hundred fifty-five thousand, six hundred sixty-one".