66928464257 has 4 divisors (see below), whose sum is σ = 66928981680. Its totient is φ = 66927946836.

The previous prime is 66928464223. The next prime is 66928464263. The reversal of 66928464257 is 75246482966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66928464257 - 2³⁴ = 49748595073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66928464196 and 66928464205.

It is not an unprimeable number, because it can be changed into a prime (66928464287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126794 + ... + 387212.

It is an arithmetic number, because the mean of its divisors is an integer number (16732245420).

Almost surely, 2^66928464257 is an apocalyptic number.

It is an amenable number.

66928464257 is a deficient number, since it is larger than the sum of its proper divisors (517423).

66928464257 is a wasteful number, since it uses less digits than its factorization.

66928464257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517422.

The product of its digits is 34836480, while the sum is 59.

The spelling of 66928464257 in words is "sixty-six billion, nine hundred twenty-eight million, four hundred sixty-four thousand, two hundred fifty-seven".