66993997159 has 4 divisors (see below), whose sum is σ = 67010695416. Its totient is φ = 66977298904.

The previous prime is 66993997141. The next prime is 66993997177. The reversal of 66993997159 is 95179939966.

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

It is an interprime number because it is at equal distance from previous prime (66993997141) and next prime (66993997177).

It is a cyclic number.

It is not a de Polignac number, because 66993997159 - 2⁹ = 66993996647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66993997091 and 66993997100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66993997139) 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, 8343109 + ... + 8351134.

It is an arithmetic number, because the mean of its divisors is an integer number (16752673854).

Almost surely, 2^66993997159 is an apocalyptic number.

66993997159 is a deficient number, since it is larger than the sum of its proper divisors (16698257).

66993997159 is a wasteful number, since it uses less digits than its factorization.

66993997159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16698256.

The product of its digits is 223205220, while the sum is 73.

The spelling of 66993997159 in words is "sixty-six billion, nine hundred ninety-three million, nine hundred ninety-seven thousand, one hundred fifty-nine".