66690474571 has 8 divisors (see below), whose sum is σ = 76230600704. Its totient is φ = 57153577320.

The previous prime is 66690474533. The next prime is 66690474577. The reversal of 66690474571 is 17547409666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66690474571 - 2³³ = 58100539979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66690474577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 762795 + ... + 845716.

It is an arithmetic number, because the mean of its divisors is an integer number (9528825088).

Almost surely, 2^66690474571 is an apocalyptic number.

66690474571 is a deficient number, since it is larger than the sum of its proper divisors (9540126133).

66690474571 is a wasteful number, since it uses less digits than its factorization.

66690474571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614441.

The product of its (nonzero) digits is 7620480, while the sum is 55.

The spelling of 66690474571 in words is "sixty-six billion, six hundred ninety million, four hundred seventy-four thousand, five hundred seventy-one".