66166170511827 has 32 divisors (see below), whose sum is σ = 89745869687040. Its totient is φ = 43355075587200.

The previous prime is 66166170511811. The next prime is 66166170511829. The reversal of 66166170511827 is 72811507166166.

It is not a de Polignac number, because 66166170511827 - 2⁴ = 66166170511811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66166170511829) 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, 406052773 + ... + 406215689.

It is an arithmetic number, because the mean of its divisors is an integer number (2804558427720).

Almost surely, 2^{66166170511827} is an apocalyptic number.

66166170511827 is a deficient number, since it is larger than the sum of its proper divisors (23579699175213).

66166170511827 is a wasteful number, since it uses less digits than its factorization.

66166170511827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172803.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 66166170511827 in words is "sixty-six trillion, one hundred sixty-six billion, one hundred seventy million, five hundred eleven thousand, eight hundred twenty-seven".