66156005101 has 2 divisors, whose sum is σ = 66156005102. Its totient is φ = 66156005100.

The previous prime is 66156005077. The next prime is 66156005107. The reversal of 66156005101 is 10150065166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66128694025 + 27311076 = 257155^2 + 5226^2 .

It is a cyclic number.

It is not a de Polignac number, because 66156005101 - 2⁷ = 66156004973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66156005107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078002550 + 33078002551.

It is an arithmetic number, because the mean of its divisors is an integer number (33078002551).

Almost surely, 2^66156005101 is an apocalyptic number.

It is an amenable number.

66156005101 is a deficient number, since it is larger than the sum of its proper divisors (1).

66156005101 is an equidigital number, since it uses as much as digits as its factorization.

66156005101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 66156005101 in words is "sixty-six billion, one hundred fifty-six million, five thousand, one hundred one".