1321546616440 has 64 divisors (see below), whose sum is σ = 3054134172960. Its totient is φ = 514282821120.

The previous prime is 1321546616419. The next prime is 1321546616447. The reversal of 1321546616440 is 446166451231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321546616447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18201810 + ... + 18274270.

Almost surely, 2^{1321546616440} is an apocalyptic number.

1321546616440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321546616440 is an abundant number, since it is smaller than the sum of its proper divisors (1732587556520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321546616440 is a wasteful number, since it uses less digits than its factorization.

1321546616440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84832 (or 84828 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 1321546616440 in words is "one trillion, three hundred twenty-one billion, five hundred forty-six million, six hundred sixteen thousand, four hundred forty".