1321552432545 has 64 divisors (see below), whose sum is σ = 2337153730560. Its totient is φ = 634268371968.

The previous prime is 1321552432517. The next prime is 1321552432609. The reversal of 1321552432545 is 5452342551231.

It is not a de Polignac number, because 1321552432545 - 2²⁷ = 1321418214817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321552432497 and 1321552432506.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14846862 + ... + 14935608.

It is an arithmetic number, because the mean of its divisors is an integer number (36518027040).

Almost surely, 2^{1321552432545} is an apocalyptic number.

1321552432545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321552432545 is a deficient number, since it is larger than the sum of its proper divisors (1015601298015).

1321552432545 is a wasteful number, since it uses less digits than its factorization.

1321552432545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91334.

The product of its digits is 720000, while the sum is 42.

Adding to 1321552432545 its reverse (5452342551231), we get a palindrome (6773894983776).

The spelling of 1321552432545 in words is "one trillion, three hundred twenty-one billion, five hundred fifty-two million, four hundred thirty-two thousand, five hundred forty-five".