66780034747 has 2 divisors, whose sum is σ = 66780034748. Its totient is φ = 66780034746.

The previous prime is 66780034691. The next prime is 66780034757. The reversal of 66780034747 is 74743008766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66780034747 - 2³⁵ = 32420296379 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66780034694 and 66780034703.

It is not a weakly prime, because it can be changed into another prime (66780034757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33390017373 + 33390017374.

It is an arithmetic number, because the mean of its divisors is an integer number (33390017374).

Almost surely, 2^66780034747 is an apocalyptic number.

66780034747 is a deficient number, since it is larger than the sum of its proper divisors (1).

66780034747 is an equidigital number, since it uses as much as digits as its factorization.

66780034747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 52.

The spelling of 66780034747 in words is "sixty-six billion, seven hundred eighty million, thirty-four thousand, seven hundred forty-seven".