666604561047100 has 36 divisors (see below), whose sum is σ = 1557803581896184. Its totient is φ = 246130914847680.

The previous prime is 666604561047077. The next prime is 666604561047101. The reversal of 666604561047100 is 1740165406666.

It is a super-3 number, since 3×666604561047100³ (a number of 45 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666604561047101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 256386368334 + ... + 256386370933.

Almost surely, 2^{666604561047100} is an apocalyptic number.

It is an amenable number.

666604561047100 is an abundant number, since it is smaller than the sum of its proper divisors (891199020849084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666604561047100 is a wasteful number, since it uses less digits than its factorization.

666604561047100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512772739294 (or 512772739287 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 666604561047100 in words is "six hundred sixty-six trillion, six hundred four billion, five hundred sixty-one million, forty-seven thousand, one hundred".