666149500 has 48 divisors (see below), whose sum is σ = 1531464480. Its totient is φ = 252432000.

The previous prime is 666149453. The next prime is 666149503. The reversal of 666149500 is 5941666.

666149500 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 666149500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666149503) 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, 25561 + ... + 44560.

It is an arithmetic number, because the mean of its divisors is an integer number (31905510).

Almost surely, 2^666149500 is an apocalyptic number.

It is an amenable number.

666149500 is an abundant number, since it is smaller than the sum of its proper divisors (865314980).

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

666149500 is a wasteful number, since it uses less digits than its factorization.

666149500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70159 (or 70147 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 666149500 is about 25809.8721422637. The cubic root of 666149500 is about 873.3545129504.

The spelling of 666149500 in words is "six hundred sixty-six million, one hundred forty-nine thousand, five hundred".