66401464641 has 8 divisors (see below), whose sum is σ = 89347536960. Its totient is φ = 43861517712.

The previous prime is 66401464609. The next prime is 66401464693. The reversal of 66401464641 is 14646410466.

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

It is not a de Polignac number, because 66401464641 - 2⁵ = 66401464609 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 66401464593 and 66401464602.

It is not an unprimeable number, because it can be changed into a prime (66401464541) 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, 101530965 + ... + 101531618.

It is an arithmetic number, because the mean of its divisors is an integer number (11168442120).

Almost surely, 2^66401464641 is an apocalyptic number.

It is an amenable number.

66401464641 is a deficient number, since it is larger than the sum of its proper divisors (22946072319).

66401464641 is a wasteful number, since it uses less digits than its factorization.

66401464641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203062695.

The product of its (nonzero) digits is 331776, while the sum is 42.

The spelling of 66401464641 in words is "sixty-six billion, four hundred one million, four hundred sixty-four thousand, six hundred forty-one".