66476665421 has 8 divisors (see below), whose sum is σ = 68338332384. Its totient is φ = 64618419600.

The previous prime is 66476665417. The next prime is 66476665427. The reversal of 66476665421 is 12456667466.

It is a happy number.

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 66476665421 - 2² = 66476665417 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 (66476665427) 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, 815855 + ... + 893628.

It is an arithmetic number, because the mean of its divisors is an integer number (8542291548).

Almost surely, 2^66476665421 is an apocalyptic number.

It is an amenable number.

66476665421 is a deficient number, since it is larger than the sum of its proper divisors (1861666963).

66476665421 is a wasteful number, since it uses less digits than its factorization.

66476665421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710571.

The product of its digits is 8709120, while the sum is 53.

The spelling of 66476665421 in words is "sixty-six billion, four hundred seventy-six million, six hundred sixty-five thousand, four hundred twenty-one".