666849229641 has 96 divisors (see below), whose sum is σ = 1233396523008. Its totient is φ = 338215933440.

The previous prime is 666849229639. The next prime is 666849229691. The reversal of 666849229641 is 146922948666.

It is not a de Polignac number, because 666849229641 - 2¹ = 666849229639 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (666849229621) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1558300 + ... + 1939586.

It is an arithmetic number, because the mean of its divisors is an integer number (12847880448).

Almost surely, 2^666849229641 is an apocalyptic number.

It is an amenable number.

666849229641 is a deficient number, since it is larger than the sum of its proper divisors (566547293367).

666849229641 is a wasteful number, since it uses less digits than its factorization.

666849229641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381411 (or 381408 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 63.

The spelling of 666849229641 in words is "six hundred sixty-six billion, eight hundred forty-nine million, two hundred twenty-nine thousand, six hundred forty-one".