1665054827281 has 16 divisors (see below), whose sum is σ = 1703540030400. Its totient is φ = 1626936540928.

The previous prime is 1665054827263. The next prime is 1665054827297. The reversal of 1665054827281 is 1827284505661.

It is a cyclic number.

It is not a de Polignac number, because 1665054827281 - 2²¹ = 1665052730129 is a prime.

It is a super-2 number, since 2×1665054827281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665054825281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7715610 + ... + 7928476.

It is an arithmetic number, because the mean of its divisors is an integer number (106471251900).

Almost surely, 2^{1665054827281} is an apocalyptic number.

It is an amenable number.

1665054827281 is a deficient number, since it is larger than the sum of its proper divisors (38485203119).

1665054827281 is a wasteful number, since it uses less digits than its factorization.

1665054827281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213728.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 1665054827281 in words is "one trillion, six hundred sixty-five billion, fifty-four million, eight hundred twenty-seven thousand, two hundred eighty-one".