66001005901 has 2 divisors, whose sum is σ = 66001005902. Its totient is φ = 66001005900.

The previous prime is 66001005893. The next prime is 66001005913. The reversal of 66001005901 is 10950010066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65969354025 + 31651876 = 256845^2 + 5626^2 .

It is a cyclic number.

It is not a de Polignac number, because 66001005901 - 2³ = 66001005893 is a prime.

It is a super-2 number, since 2×66001005901² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66001005901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66001005001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000502950 + 33000502951.

It is an arithmetic number, because the mean of its divisors is an integer number (33000502951).

Almost surely, 2^66001005901 is an apocalyptic number.

It is an amenable number.

66001005901 is a deficient number, since it is larger than the sum of its proper divisors (1).

66001005901 is an equidigital number, since it uses as much as digits as its factorization.

66001005901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

Adding to 66001005901 its reverse (10950010066), we get a palindrome (76951015967).

The spelling of 66001005901 in words is "sixty-six billion, one million, five thousand, nine hundred one".