661163683050 has 288 divisors, whose sum is σ = 1952458784640. Its totient is φ = 159418022400.

The previous prime is 661163682997. The next prime is 661163683079. The reversal of 661163683050 is 50386361166.

661163683050 is a `hidden beast` number, since 6 + 6 + 1 + 1 + 636 + 8 + 3 + 0 + 5 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 661163682987 and 661163683005.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 65204881 + ... + 65215019.

It is an arithmetic number, because the mean of its divisors is an integer number (6779370780).

Almost surely, 2^661163683050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661163683050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976229392320).

661163683050 is an abundant number, since it is smaller than the sum of its proper divisors (1291295101590).

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

661163683050 is a wasteful number, since it uses less digits than its factorization.

661163683050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10398 (or 10390 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 661163683050 in words is "six hundred sixty-one billion, one hundred sixty-three million, six hundred eighty-three thousand, fifty".