661195200 has 168 divisors, whose sum is σ = 2187082240. Its totient is φ = 174873600.

The previous prime is 661195189. The next prime is 661195247. The reversal of 661195200 is 2591166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 666705 + ... + 667695.

Almost surely, 2^661195200 is an apocalyptic number.

661195200 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 661195200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093541120).

661195200 is an abundant number, since it is smaller than the sum of its proper divisors (1525887040).

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

661195200 is a wasteful number, since it uses less digits than its factorization.

661195200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 661195200 is about 25713.7161841691. The cubic root of 661195200 is about 871.1840134816.

The spelling of 661195200 in words is "six hundred sixty-one million, one hundred ninety-five thousand, two hundred".