66579743569 has 8 divisors (see below), whose sum is σ = 66693936960. Its totient is φ = 66465634800.

The previous prime is 66579743567. The next prime is 66579743591. The reversal of 66579743569 is 96534797566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66579743569 - 2¹ = 66579743567 is a prime.

It is a super-2 number, since 2×66579743569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66579743561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667499 + ... + 1706959.

It is an arithmetic number, because the mean of its divisors is an integer number (8336742120).

Almost surely, 2^66579743569 is an apocalyptic number.

It is an amenable number.

66579743569 is a deficient number, since it is larger than the sum of its proper divisors (114193391).

66579743569 is a wasteful number, since it uses less digits than its factorization.

66579743569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42311.

The product of its digits is 257191200, while the sum is 67.

The spelling of 66579743569 in words is "sixty-six billion, five hundred seventy-nine million, seven hundred forty-three thousand, five hundred sixty-nine".