665710651105 has 32 divisors (see below), whose sum is σ = 851210283168. Its totient is φ = 498067046400.

The previous prime is 665710651103. The next prime is 665710651117. The reversal of 665710651105 is 501156017566.

It can be written as a sum of positive squares in 16 ways, for example, as 403132295329 + 262578355776 = 634927^2 + 512424^2 .

It is not a de Polignac number, because 665710651105 - 2¹ = 665710651103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665710651103) 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, 14429775 + ... + 14475835.

It is an arithmetic number, because the mean of its divisors is an integer number (26600321349).

Almost surely, 2^665710651105 is an apocalyptic number.

It is an amenable number.

665710651105 is a deficient number, since it is larger than the sum of its proper divisors (185499632063).

665710651105 is a wasteful number, since it uses less digits than its factorization.

665710651105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47157.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 665710651105 in words is "six hundred sixty-five billion, seven hundred ten million, six hundred fifty-one thousand, one hundred five".