661652226 has 40 divisors (see below), whose sum is σ = 1533725820. Its totient is φ = 212944032.

The previous prime is 661652221. The next prime is 661652239. The reversal of 661652226 is 622256166.

It can be written as a sum of positive squares in 2 ways, for example, as 595311201 + 66341025 = 24399^2 + 8145^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661652221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 65721 + ... + 75116.

Almost surely, 2^661652226 is an apocalyptic number.

661652226 is an abundant number, since it is smaller than the sum of its proper divisors (872073594).

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

661652226 is a wasteful number, since it uses less digits than its factorization.

661652226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140880 (or 140871 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 661652226 is about 25722.6014625271. The cubic root of 661652226 is about 871.3846915083.

The spelling of 661652226 in words is "six hundred sixty-one million, six hundred fifty-two thousand, two hundred twenty-six".