66353165641 has 8 divisors (see below), whose sum is σ = 76021300224. Its totient is φ = 56732308800.

The previous prime is 66353165629. The next prime is 66353165729. The reversal of 66353165641 is 14656135366.

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 66353165641 - 2⁵ = 66353165609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66353165591 and 66353165600.

It is not an unprimeable number, because it can be changed into a prime (66353165611) 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, 11816425 + ... + 11822038.

It is an arithmetic number, because the mean of its divisors is an integer number (9502662528).

Almost surely, 2^66353165641 is an apocalyptic number.

It is an amenable number.

66353165641 is a deficient number, since it is larger than the sum of its proper divisors (9668134583).

66353165641 is a wasteful number, since it uses less digits than its factorization.

66353165641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23638871.

The product of its digits is 1166400, while the sum is 46.

The spelling of 66353165641 in words is "sixty-six billion, three hundred fifty-three million, one hundred sixty-five thousand, six hundred forty-one".