215581517783 has 2 divisors, whose sum is σ = 215581517784. Its totient is φ = 215581517782.

The previous prime is 215581517639. The next prime is 215581517807. The reversal of 215581517783 is 387715185512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215581517783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215581517183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107790758891 + 107790758892.

It is an arithmetic number, because the mean of its divisors is an integer number (107790758892).

Almost surely, 2^215581517783 is an apocalyptic number.

215581517783 is a deficient number, since it is larger than the sum of its proper divisors (1).

215581517783 is an equidigital number, since it uses as much as digits as its factorization.

215581517783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352000, while the sum is 53.

The spelling of 215581517783 in words is "two hundred fifteen billion, five hundred eighty-one million, five hundred seventeen thousand, seven hundred eighty-three".