215420566626 has 12 divisors (see below), whose sum is σ = 466744561062. Its totient is φ = 71806855536.

The previous prime is 215420566609. The next prime is 215420566631. The reversal of 215420566626 is 626665024512.

It can be written as a sum of positive squares in only one way, i.e., 184285611225 + 31134955401 = 429285^2 + 176451^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5983904611 + ... + 5983904646.

Almost surely, 2^215420566626 is an apocalyptic number.

215420566626 is an abundant number, since it is smaller than the sum of its proper divisors (251323994436).

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

215420566626 is a wasteful number, since it uses less digits than its factorization.

215420566626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11967809265 (or 11967809262 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 215420566626 in words is "two hundred fifteen billion, four hundred twenty million, five hundred sixty-six thousand, six hundred twenty-six".