1665536425256 has 64 divisors (see below), whose sum is σ = 3453304492800. Its totient is φ = 746778784000.

The previous prime is 1665536425213. The next prime is 1665536425303. The reversal of 1665536425256 is 6525246355661.

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, 2042561 + ... + 2739183.

It is an arithmetic number, because the mean of its divisors is an integer number (53957882700).

Almost surely, 2^{1665536425256} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665536425256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1726652246400).

1665536425256 is an abundant number, since it is smaller than the sum of its proper divisors (1787768067544).

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

1665536425256 is a wasteful number, since it uses less digits than its factorization.

1665536425256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697010 (or 697006 counting only the distinct ones).

The product of its digits is 38880000, while the sum is 56.

The spelling of 1665536425256 in words is "one trillion, six hundred sixty-five billion, five hundred thirty-six million, four hundred twenty-five thousand, two hundred fifty-six".