66139583659 has 4 divisors (see below), whose sum is σ = 66141155016. Its totient is φ = 66138012304.

The previous prime is 66139583651. The next prime is 66139583689. The reversal of 66139583659 is 95638593166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66139583659 - 2³ = 66139583651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66139583597 and 66139583606.

It is not an unprimeable number, because it can be changed into a prime (66139583651) 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, 720754 + ... + 807319.

It is an arithmetic number, because the mean of its divisors is an integer number (16535288754).

Almost surely, 2^66139583659 is an apocalyptic number.

66139583659 is a deficient number, since it is larger than the sum of its proper divisors (1571357).

66139583659 is a wasteful number, since it uses less digits than its factorization.

66139583659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571356.

The product of its digits is 31492800, while the sum is 61.

The spelling of 66139583659 in words is "sixty-six billion, one hundred thirty-nine million, five hundred eighty-three thousand, six hundred fifty-nine".