215502947783 has 4 divisors (see below), whose sum is σ = 222454655808. Its totient is φ = 208551239760.

The previous prime is 215502947753. The next prime is 215502947797. The reversal of 215502947783 is 387749205512.

215502947783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215502947783 - 2⁶ = 215502947719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215502947753) 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 3 ways as a sum of consecutive naturals, for example, 3475853966 + ... + 3475854027.

It is an arithmetic number, because the mean of its divisors is an integer number (55613663952).

Almost surely, 2^215502947783 is an apocalyptic number.

215502947783 is a deficient number, since it is larger than the sum of its proper divisors (6951708025).

215502947783 is an equidigital number, since it uses as much as digits as its factorization.

215502947783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6951708024.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 215502947783 in words is "two hundred fifteen billion, five hundred two million, nine hundred forty-seven thousand, seven hundred eighty-three".