66050505497 has 4 divisors (see below), whose sum is σ = 66051042660. Its totient is φ = 66049968336.

The previous prime is 66050505463. The next prime is 66050505523. The reversal of 66050505497 is 79450505066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24264604441 + 41785901056 = 155771^2 + 204416^2 .

It is a cyclic number.

It is not a de Polignac number, because 66050505497 - 2¹⁰ = 66050504473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66050505197) 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, 17279 + ... + 363867.

It is an arithmetic number, because the mean of its divisors is an integer number (16512760665).

Almost surely, 2^66050505497 is an apocalyptic number.

It is an amenable number.

66050505497 is a deficient number, since it is larger than the sum of its proper divisors (537163).

66050505497 is a wasteful number, since it uses less digits than its factorization.

66050505497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537162.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 66050505497 in words is "sixty-six billion, fifty million, five hundred five thousand, four hundred ninety-seven".