215158810685 has 32 divisors (see below), whose sum is σ = 317814346752. Its totient is φ = 136170720000.

The previous prime is 215158810681. The next prime is 215158810709. The reversal of 215158810685 is 586018851512.

It is a happy number.

215158810685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215158810685 - 2² = 215158810681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215158810681) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4071935 + ... + 4124435.

It is an arithmetic number, because the mean of its divisors is an integer number (9931698336).

Almost surely, 2^215158810685 is an apocalyptic number.

It is an amenable number.

215158810685 is a deficient number, since it is larger than the sum of its proper divisors (102655536067).

215158810685 is a wasteful number, since it uses less digits than its factorization.

215158810685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61533.

The product of its (nonzero) digits is 768000, while the sum is 50.

The spelling of 215158810685 in words is "two hundred fifteen billion, one hundred fifty-eight million, eight hundred ten thousand, six hundred eighty-five".