1565421742336 has 72 divisors (see below), whose sum is σ = 3181576426560. Its totient is φ = 768503556096.

The previous prime is 1565421742327. The next prime is 1565421742337. The reversal of 1565421742336 is 6332471245651.

It is a self number, because there is not a number n which added to its sum of digits gives 1565421742336.

It is not an unprimeable number, because it can be changed into a prime (1565421742337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12367626 + ... + 12493558.

It is an arithmetic number, because the mean of its divisors is an integer number (44188561480).

Almost surely, 2^{1565421742336} is an apocalyptic number.

1565421742336 is a gapful number since it is divisible by the number (16) 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 1565421742336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1590788213280).

1565421742336 is an abundant number, since it is smaller than the sum of its proper divisors (1616154684224).

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

1565421742336 is an equidigital number, since it uses as much as digits as its factorization.

1565421742336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126831 (or 126817 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 49.

Adding to 1565421742336 its reverse (6332471245651), we get a palindrome (7897892987987).

The spelling of 1565421742336 in words is "one trillion, five hundred sixty-five billion, four hundred twenty-one million, seven hundred forty-two thousand, three hundred thirty-six".