66403696741 has 2 divisors, whose sum is σ = 66403696742. Its totient is φ = 66403696740.

The previous prime is 66403696729. The next prime is 66403696781. The reversal of 66403696741 is 14769630466.

66403696741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66301100100 + 102596641 = 257490^2 + 10129^2 .

It is a cyclic number.

It is not a de Polignac number, because 66403696741 - 2⁷ = 66403696613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66403696781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33201848370 + 33201848371.

It is an arithmetic number, because the mean of its divisors is an integer number (33201848371).

Almost surely, 2^66403696741 is an apocalyptic number.

It is an amenable number.

66403696741 is a deficient number, since it is larger than the sum of its proper divisors (1).

66403696741 is an equidigital number, since it uses as much as digits as its factorization.

66403696741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 52.

The spelling of 66403696741 in words is "sixty-six billion, four hundred three million, six hundred ninety-six thousand, seven hundred forty-one".