215651331044 has 24 divisors (see below), whose sum is σ = 394083469248. Its totient is φ = 103062849120.

The previous prime is 215651331031. The next prime is 215651331131. The reversal of 215651331044 is 440133156512.

215651331044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 215651330995 and 215651331013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721622 + ... + 975725.

It is an arithmetic number, because the mean of its divisors is an integer number (16420144552).

Almost surely, 2^215651331044 is an apocalyptic number.

It is an amenable number.

215651331044 is a deficient number, since it is larger than the sum of its proper divisors (178432138204).

215651331044 is a wasteful number, since it uses less digits than its factorization.

215651331044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698755 (or 1698753 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 215651331044 its reverse (440133156512), we get a palindrome (655784487556).

The spelling of 215651331044 in words is "two hundred fifteen billion, six hundred fifty-one million, three hundred thirty-one thousand, forty-four".