661201626 has 32 divisors (see below), whose sum is σ = 1358945280. Its totient is φ = 214354224.

The previous prime is 661201603. The next prime is 661201643. The reversal of 661201626 is 626102166.

661201626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661201593 and 661201602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56301 + ... + 67023.

It is an arithmetic number, because the mean of its divisors is an integer number (42467040).

Almost surely, 2^661201626 is an apocalyptic number.

661201626 is an abundant number, since it is smaller than the sum of its proper divisors (697743654).

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

661201626 is a wasteful number, since it uses less digits than its factorization.

661201626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 661201626 is about 25713.8411366330. The cubic root of 661201626 is about 871.1868357497.

The spelling of 661201626 in words is "six hundred sixty-one million, two hundred one thousand, six hundred twenty-six".