82666669439 has 4 divisors (see below), whose sum is σ = 83317588224. Its totient is φ = 82015750656.

The previous prime is 82666669411. The next prime is 82666669453. The reversal of 82666669439 is 93496666628.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82666669439 is a prime.

It is a super-2 number, since 2×82666669439² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82666662439) 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, 325459202 + ... + 325459455.

It is an arithmetic number, because the mean of its divisors is an integer number (20829397056).

Almost surely, 2^82666669439 is an apocalyptic number.

82666669439 is a deficient number, since it is larger than the sum of its proper divisors (650918785).

82666669439 is a wasteful number, since it uses less digits than its factorization.

82666669439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650918784.

The product of its digits is 120932352, while the sum is 65.

The spelling of 82666669439 in words is "eighty-two billion, six hundred sixty-six million, six hundred sixty-nine thousand, four hundred thirty-nine".