661432783050 has 216 divisors, whose sum is σ = 1939440582144. Its totient is φ = 161529863040.

The previous prime is 661432783049. The next prime is 661432783171. The reversal of 661432783050 is 50387234166.

661432783050 is a `hidden beast` number, since 6 + 6 + 14 + 327 + 8 + 305 + 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 = 661432782987 and 661432783005.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 9624109 + ... + 9692591.

It is an arithmetic number, because the mean of its divisors is an integer number (8978891584).

Almost surely, 2^661432783050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661432783050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969720291072).

661432783050 is an abundant number, since it is smaller than the sum of its proper divisors (1278007799094).

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

661432783050 is a wasteful number, since it uses less digits than its factorization.

661432783050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68654 (or 68633 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 661432783050 in words is "six hundred sixty-one billion, four hundred thirty-two million, seven hundred eighty-three thousand, fifty".