216761536787 has 2 divisors, whose sum is σ = 216761536788. Its totient is φ = 216761536786.

The previous prime is 216761536757. The next prime is 216761536807. The reversal of 216761536787 is 787635167612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216761536787 - 2⁶ = 216761536723 is a prime.

It is not a weakly prime, because it can be changed into another prime (216761536757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108380768393 + 108380768394.

It is an arithmetic number, because the mean of its divisors is an integer number (108380768394).

Almost surely, 2^216761536787 is an apocalyptic number.

216761536787 is a deficient number, since it is larger than the sum of its proper divisors (1).

216761536787 is an equidigital number, since it uses as much as digits as its factorization.

216761536787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17781120, while the sum is 59.

The spelling of 216761536787 in words is "two hundred sixteen billion, seven hundred sixty-one million, five hundred thirty-six thousand, seven hundred eighty-seven".