661963192200 has 324 divisors, whose sum is σ = 2255673137445. Its totient is φ = 173973744000.

The previous prime is 661963192183. The next prime is 661963192213. The reversal of 661963192200 is 2291369166.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

661963192200 is a `hidden beast` number, since 6 + 6 + 1 + 9 + 631 + 9 + 2 + 2 + 0 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 648723928356 + 13239263844 = 805434^2 + 115062^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=575310.

It is a super-2 number, since 2×661963192200² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4383862125 + ... + 4383862275.

Almost surely, 2^661963192200 is an apocalyptic number.

661963192200 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 661963192200

661963192200 is an abundant number, since it is smaller than the sum of its proper divisors (1593709945245).

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

661963192200 is a wasteful number, since it uses less digits than its factorization.

661963192200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 661963192200 in words is "six hundred sixty-one billion, nine hundred sixty-three million, one hundred ninety-two thousand, two hundred".