66488515193 has 4 divisors (see below), whose sum is σ = 70399604340. Its totient is φ = 62577426048.

The previous prime is 66488515183. The next prime is 66488515213. The reversal of 66488515193 is 39151588466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52387427689 + 14101087504 = 228883^2 + 118748^2 .

It is a cyclic number.

It is not a de Polignac number, because 66488515193 - 2⁶ = 66488515129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66488515103) 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, 1955544548 + ... + 1955544581.

It is an arithmetic number, because the mean of its divisors is an integer number (17599901085).

Almost surely, 2^66488515193 is an apocalyptic number.

It is an amenable number.

66488515193 is a deficient number, since it is larger than the sum of its proper divisors (3911089147).

66488515193 is a wasteful number, since it uses less digits than its factorization.

66488515193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911089146.

The product of its digits is 6220800, while the sum is 56.

The spelling of 66488515193 in words is "sixty-six billion, four hundred eighty-eight million, five hundred fifteen thousand, one hundred ninety-three".