666462501646 has 32 divisors (see below), whose sum is σ = 1053821871360. Its totient is φ = 315626997504.

The previous prime is 666462501643. The next prime is 666462501667. The reversal of 666462501646 is 646105264666.

It is a super-2 number, since 2×666462501646² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666462501593 and 666462501602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666462501643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42760771 + ... + 42776353.

It is an arithmetic number, because the mean of its divisors is an integer number (32931933480).

Almost surely, 2^666462501646 is an apocalyptic number.

666462501646 is a deficient number, since it is larger than the sum of its proper divisors (387359369714).

666462501646 is a wasteful number, since it uses less digits than its factorization.

666462501646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29580.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 666462501646 in words is "six hundred sixty-six billion, four hundred sixty-two million, five hundred one thousand, six hundred forty-six".