2066148781 has 2 divisors, whose sum is σ = 2066148782. Its totient is φ = 2066148780.

The previous prime is 2066148739. The next prime is 2066148809. The reversal of 2066148781 is 1878416602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1495368900 + 570779881 = 38670^2 + 23891^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066148781 - 2⁷ = 2066148653 is a prime.

It is a super-2 number, since 2×2066148781² = 8537941570455571922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2066148281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033074390 + 1033074391.

It is an arithmetic number, because the mean of its divisors is an integer number (1033074391).

Almost surely, 2^2066148781 is an apocalyptic number.

It is an amenable number.

2066148781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2066148781 is an equidigital number, since it uses as much as digits as its factorization.

2066148781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 2066148781 is about 45454.9093168164. The cubic root of 2066148781 is about 1273.6610382406.

The spelling of 2066148781 in words is "two billion, sixty-six million, one hundred forty-eight thousand, seven hundred eighty-one".