215151078656 has 72 divisors (see below), whose sum is σ = 443792364288. Its totient is φ = 104101670400.

The previous prime is 215151078647. The next prime is 215151078689. The reversal of 215151078656 is 656870151512.

It is a self number, because there is not a number n which added to its sum of digits gives 215151078656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7612391 + ... + 7640601.

Almost surely, 2^215151078656 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 215151078656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221896182144).

215151078656 is an abundant number, since it is smaller than the sum of its proper divisors (228641285632).

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

215151078656 is an frugal number, since it uses more digits than its factorization.

215151078656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28320 (or 28244 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 215151078656 in words is "two hundred fifteen billion, one hundred fifty-one million, seventy-eight thousand, six hundred fifty-six".