66200017069981 has 2 divisors, whose sum is σ = 66200017069982. Its totient is φ = 66200017069980.

The previous prime is 66200017069969. The next prime is 66200017070071. The reversal of 66200017069981 is 18996071000266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44627289893956 + 21572727176025 = 6680366^2 + 4644645^2 .

It is a cyclic number.

It is not a de Polignac number, because 66200017069981 - 2¹⁵ = 66200017037213 is a prime.

It is a super-2 number, since 2×66200017069981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66200017069181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33100008534990 + 33100008534991.

It is an arithmetic number, because the mean of its divisors is an integer number (33100008534991).

Almost surely, 2^{66200017069981} is an apocalyptic number.

It is an amenable number.

66200017069981 is a deficient number, since it is larger than the sum of its proper divisors (1).

66200017069981 is an equidigital number, since it uses as much as digits as its factorization.

66200017069981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 66200017069981 in words is "sixty-six trillion, two hundred billion, seventeen million, sixty-nine thousand, nine hundred eighty-one".