1443505345665 has 32 divisors (see below), whose sum is σ = 2366799837696. Its totient is φ = 750917571840.

The previous prime is 1443505345661. The next prime is 1443505345679. The reversal of 1443505345665 is 5665435053441.

It is a happy number.

It is not a de Polignac number, because 1443505345665 - 2² = 1443505345661 is a prime.

It is a super-2 number, since 2×1443505345665² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1443505345661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3287506 + ... + 3700635.

It is an arithmetic number, because the mean of its divisors is an integer number (73962494928).

Almost surely, 2^{1443505345665} is an apocalyptic number.

1443505345665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1443505345665 is a deficient number, since it is larger than the sum of its proper divisors (923294492031).

1443505345665 is a wasteful number, since it uses less digits than its factorization.

1443505345665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6988489.

The product of its (nonzero) digits is 12960000, while the sum is 51.

The spelling of 1443505345665 in words is "one trillion, four hundred forty-three billion, five hundred five million, three hundred forty-five thousand, six hundred sixty-five".