215481689755 has 16 divisors (see below), whose sum is σ = 283229485920. Its totient is φ = 156650378752.

The previous prime is 215481689693. The next prime is 215481689779. The reversal of 215481689755 is 557986184512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 215481689755 - 2⁷ = 215481689627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215481689693 and 215481689702.

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, 43705789 + ... + 43710718.

It is an arithmetic number, because the mean of its divisors is an integer number (17701842870).

Almost surely, 2^215481689755 is an apocalyptic number.

215481689755 is a deficient number, since it is larger than the sum of its proper divisors (67747796165).

215481689755 is a wasteful number, since it uses less digits than its factorization.

215481689755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87416558.

The product of its digits is 24192000, while the sum is 61.

The spelling of 215481689755 in words is "two hundred fifteen billion, four hundred eighty-one million, six hundred eighty-nine thousand, seven hundred fifty-five".