666442521153 has 16 divisors (see below), whose sum is σ = 989736260800. Its totient is φ = 443208710880.

The previous prime is 666442521149. The next prime is 666442521187. The reversal of 666442521153 is 351125244666.

It is not a de Polignac number, because 666442521153 - 2² = 666442521149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666442521099 and 666442521108.

It is not an unprimeable number, because it can be changed into a prime (666442521053) 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, 30163843 + ... + 30185928.

It is an arithmetic number, because the mean of its divisors is an integer number (61858516300).

Almost surely, 2^666442521153 is an apocalyptic number.

It is an amenable number.

666442521153 is a deficient number, since it is larger than the sum of its proper divisors (323293739647).

666442521153 is a wasteful number, since it uses less digits than its factorization.

666442521153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60350189 (or 60350183 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 666442521153 in words is "six hundred sixty-six billion, four hundred forty-two million, five hundred twenty-one thousand, one hundred fifty-three".