66400070117 has 2 divisors, whose sum is σ = 66400070118. Its totient is φ = 66400070116.

The previous prime is 66400070101. The next prime is 66400070123. The reversal of 66400070117 is 71107000466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38594174116 + 27805896001 = 196454^2 + 166751^2 .

It is a cyclic number.

It is not a de Polignac number, because 66400070117 - 2⁴ = 66400070101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66400070147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33200035058 + 33200035059.

It is an arithmetic number, because the mean of its divisors is an integer number (33200035059).

Almost surely, 2^66400070117 is an apocalyptic number.

It is an amenable number.

66400070117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66400070117 is an equidigital number, since it uses as much as digits as its factorization.

66400070117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The spelling of 66400070117 in words is "sixty-six billion, four hundred million, seventy thousand, one hundred seventeen".