661758076 has 48 divisors (see below), whose sum is σ = 1384689600. Its totient is φ = 270724608.

The previous prime is 661758037. The next prime is 661758079. The reversal of 661758076 is 670857166.

661758076 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661758079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67690 + ... + 76846.

It is an arithmetic number, because the mean of its divisors is an integer number (28847700).

Almost surely, 2^661758076 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661758076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (692344800).

661758076 is an abundant number, since it is smaller than the sum of its proper divisors (722931524).

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

661758076 is a wasteful number, since it uses less digits than its factorization.

661758076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9286 (or 9284 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 661758076 is about 25724.6589093033. The cubic root of 661758076 is about 871.4311565785.

The spelling of 661758076 in words is "six hundred sixty-one million, seven hundred fifty-eight thousand, seventy-six".