215138346755 has 8 divisors (see below), whose sum is σ = 261066758400. Its totient is φ = 170176849216.

The previous prime is 215138346719. The next prime is 215138346757. The reversal of 215138346755 is 557643831512.

215138346755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215138346755 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215138346757) 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 7 ways as a sum of consecutive naturals, for example, 241728035 + ... + 241728924.

It is an arithmetic number, because the mean of its divisors is an integer number (32633344800).

Almost surely, 2^215138346755 is an apocalyptic number.

215138346755 is a deficient number, since it is larger than the sum of its proper divisors (45928411645).

215138346755 is an equidigital number, since it uses as much as digits as its factorization.

215138346755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483457053.

The product of its digits is 3024000, while the sum is 50.

The spelling of 215138346755 in words is "two hundred fifteen billion, one hundred thirty-eight million, three hundred forty-six thousand, seven hundred fifty-five".