66746915597 has 8 divisors (see below), whose sum is σ = 67348737144. Its totient is φ = 66145289728.

The previous prime is 66746915569. The next prime is 66746915633. The reversal of 66746915597 is 79551964766.

It can be written as a sum of positive squares in 4 ways, for example, as 4575981316 + 62170934281 = 67646^2 + 249341^2 .

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 66746915597 - 2⁸ = 66746915341 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 (66746995597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685823 + ... + 777075.

It is an arithmetic number, because the mean of its divisors is an integer number (8418592143).

Almost surely, 2^66746915597 is an apocalyptic number.

It is an amenable number.

66746915597 is a deficient number, since it is larger than the sum of its proper divisors (601821547).

66746915597 is a wasteful number, since it uses less digits than its factorization.

66746915597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97839.

The product of its digits is 85730400, while the sum is 65.

The spelling of 66746915597 in words is "sixty-six billion, seven hundred forty-six million, nine hundred fifteen thousand, five hundred ninety-seven".