66430625717 has 4 divisors (see below), whose sum is σ = 66447158880. Its totient is φ = 66414092556.

The previous prime is 66430625689. The next prime is 66430625761. The reversal of 66430625717 is 71752603466.

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.

It is a cyclic number.

It is not a de Polignac number, because 66430625717 - 2²² = 66426431413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66430625017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8260553 + ... + 8268590.

It is an arithmetic number, because the mean of its divisors is an integer number (16611789720).

Almost surely, 2^66430625717 is an apocalyptic number.

It is an amenable number.

66430625717 is a deficient number, since it is larger than the sum of its proper divisors (16533163).

66430625717 is a wasteful number, since it uses less digits than its factorization.

66430625717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16533162.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The spelling of 66430625717 in words is "sixty-six billion, four hundred thirty million, six hundred twenty-five thousand, seven hundred seventeen".