66652177007765 has 16 divisors (see below), whose sum is σ = 80770394516400. Its totient is φ = 52797488873472.

The previous prime is 66652177007761. The next prime is 66652177007863. The reversal of 66652177007765 is 56770077125666.

It can be written as a sum of positive squares in 8 ways, for example, as 11386021965124 + 55266155042641 = 3374318^2 + 7434121^2 .

It is a cyclic number.

It is not a de Polignac number, because 66652177007765 - 2² = 66652177007761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66652177007761) 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, 57888020 + ... + 59028189.

It is an arithmetic number, because the mean of its divisors is an integer number (5048149657275).

Almost surely, 2^{66652177007765} is an apocalyptic number.

It is an amenable number.

66652177007765 is a deficient number, since it is larger than the sum of its proper divisors (14118217508635).

66652177007765 is a wasteful number, since it uses less digits than its factorization.

66652177007765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116917336.

The product of its (nonzero) digits is 155584800, while the sum is 65.

The spelling of 66652177007765 in words is "sixty-six trillion, six hundred fifty-two billion, one hundred seventy-seven million, seven thousand, seven hundred sixty-five".