66697704819 has 6 divisors (see below), whose sum is σ = 96341129196. Its totient is φ = 44465136540.

The previous prime is 66697704701. The next prime is 66697704863. The reversal of 66697704819 is 91840779666.

It is not a de Polignac number, because 66697704819 - 2¹³ = 66697696627 is a prime.

It is a super-2 number, since 2×66697704819² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66697704419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3705428037 + ... + 3705428054.

It is an arithmetic number, because the mean of its divisors is an integer number (16056854866).

Almost surely, 2^66697704819 is an apocalyptic number.

66697704819 is a deficient number, since it is larger than the sum of its proper divisors (29643424377).

66697704819 is a wasteful number, since it uses less digits than its factorization.

66697704819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410856097 (or 7410856094 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 66697704819 in words is "sixty-six billion, six hundred ninety-seven million, seven hundred four thousand, eight hundred nineteen".