661425000 has 96 divisors (see below), whose sum is σ = 2067055200. Its totient is φ = 176360000.

The previous prime is 661424993. The next prime is 661425019. The reversal of 661425000 is 524166.

661425000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70591 + ... + 79409.

It is an arithmetic number, because the mean of its divisors is an integer number (21531825).

Almost surely, 2^661425000 is an apocalyptic number.

661425000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661425000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1033527600).

661425000 is an abundant number, since it is smaller than the sum of its proper divisors (1405630200).

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

661425000 is an equidigital number, since it uses as much as digits as its factorization.

661425000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8853 (or 8829 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 661425000 is about 25718.1842282849. The cubic root of 661425000 is about 871.2849291656.

Adding to 661425000 its reverse (524166), we get a palindrome (661949166).

The spelling of 661425000 in words is "six hundred sixty-one million, four hundred twenty-five thousand".