66004546407265 has 4 divisors (see below), whose sum is σ = 79205455688724. Its totient is φ = 52803637125808.

The previous prime is 66004546407259. The next prime is 66004546407281. The reversal of 66004546407265 is 56270464540066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50206520950336 + 15798025456929 = 7085656^2 + 3974673^2 .

It is a cyclic number.

It is not a de Polignac number, because 66004546407265 - 2²⁵ = 66004512852833 is a prime.

It is a super-4 number, since 4×66004546407265⁴ (a number of 56 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6600454640722 + ... + 6600454640731.

It is an arithmetic number, because the mean of its divisors is an integer number (19801363922181).

Almost surely, 2^{66004546407265} is an apocalyptic number.

It is an amenable number.

66004546407265 is a deficient number, since it is larger than the sum of its proper divisors (13200909281459).

66004546407265 is a wasteful number, since it uses less digits than its factorization.

66004546407265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13200909281458.

The product of its (nonzero) digits is 29030400, while the sum is 55.

The spelling of 66004546407265 in words is "sixty-six trillion, four billion, five hundred forty-six million, four hundred seven thousand, two hundred sixty-five".