661136476 has 96 divisors (see below), whose sum is σ = 1564512768. Its totient is φ = 236079360.

The previous prime is 661136471. The next prime is 661136507. The reversal of 661136476 is 674631166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661136471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 652146 + ... + 653158.

It is an arithmetic number, because the mean of its divisors is an integer number (16297008).

Almost surely, 2^661136476 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 661136476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782256384).

661136476 is an abundant number, since it is smaller than the sum of its proper divisors (903376292).

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

661136476 is a wasteful number, since it uses less digits than its factorization.

661136476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1209 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 661136476 is about 25712.5742779676. The cubic root of 661136476 is about 871.1582213380.

The spelling of 661136476 in words is "six hundred sixty-one million, one hundred thirty-six thousand, four hundred seventy-six".