215677028947 has 2 divisors, whose sum is σ = 215677028948. Its totient is φ = 215677028946.

The previous prime is 215677028909. The next prime is 215677028989. The reversal of 215677028947 is 749820776512.

215677028947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215677028947 - 2¹⁵ = 215676996179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215677028891 and 215677028900.

It is not a weakly prime, because it can be changed into another prime (215677028747) 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 as a sum of consecutive naturals, namely, 107838514473 + 107838514474.

It is an arithmetic number, because the mean of its divisors is an integer number (107838514474).

Almost surely, 2^215677028947 is an apocalyptic number.

215677028947 is a deficient number, since it is larger than the sum of its proper divisors (1).

215677028947 is an equidigital number, since it uses as much as digits as its factorization.

215677028947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11854080, while the sum is 58.

The spelling of 215677028947 in words is "two hundred fifteen billion, six hundred seventy-seven million, twenty-eight thousand, nine hundred forty-seven".