661122302250 has 128 divisors (see below), whose sum is σ = 1679947776000. Its totient is φ = 173123457600.

The previous prime is 661122302233. The next prime is 661122302279. The reversal of 661122302250 is 52203221166.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43490151 + ... + 43505349.

It is an arithmetic number, because the mean of its divisors is an integer number (13124592000).

Almost surely, 2^661122302250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661122302250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839973888000).

661122302250 is an abundant number, since it is smaller than the sum of its proper divisors (1018825473750).

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

661122302250 is a wasteful number, since it uses less digits than its factorization.

661122302250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16261 (or 16251 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 661122302250 in words is "six hundred sixty-one billion, one hundred twenty-two million, three hundred two thousand, two hundred fifty".