1581365604480 has 128 divisors (see below), whose sum is σ = 5052246635520. Its totient is φ = 420723376128.

The previous prime is 1581365604473. The next prime is 1581365604517. The reversal of 1581365604480 is 844065631851.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119712 + ... + 1782431.

It is an arithmetic number, because the mean of its divisors is an integer number (39470676840).

Almost surely, 2^{1581365604480} is an apocalyptic number.

1581365604480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1581365604480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2526123317760).

1581365604480 is an abundant number, since it is smaller than the sum of its proper divisors (3470881031040).

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

1581365604480 is a wasteful number, since it uses less digits than its factorization.

1581365604480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902598 (or 1902586 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 1581365604480 in words is "one trillion, five hundred eighty-one billion, three hundred sixty-five million, six hundred four thousand, four hundred eighty".