666462501641 has 16 divisors (see below), whose sum is σ = 686419816320. Its totient is φ = 646853873280.

The previous prime is 666462501619. The next prime is 666462501643. The reversal of 666462501641 is 146105264666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666462501641 is a prime.

It is a Duffinian number.

It is a Curzon number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1156850 + ... + 1634388.

It is an arithmetic number, because the mean of its divisors is an integer number (42901238520).

Almost surely, 2^666462501641 is an apocalyptic number.

666462501641 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

666462501641 is a deficient number, since it is larger than the sum of its proper divisors (19957314679).

666462501641 is a wasteful number, since it uses less digits than its factorization.

666462501641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477904.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 666462501641 in words is "six hundred sixty-six billion, four hundred sixty-two million, five hundred one thousand, six hundred forty-one".