216534421651 has 2 divisors, whose sum is σ = 216534421652. Its totient is φ = 216534421650.

The previous prime is 216534421627. The next prime is 216534421669. The reversal of 216534421651 is 156124435612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216534421651 - 2¹⁵ = 216534388883 is a prime.

It is not a weakly prime, because it can be changed into another prime (216534421451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108267210825 + 108267210826.

It is an arithmetic number, because the mean of its divisors is an integer number (108267210826).

Almost surely, 2^216534421651 is an apocalyptic number.

216534421651 is a deficient number, since it is larger than the sum of its proper divisors (1).

216534421651 is an equidigital number, since it uses as much as digits as its factorization.

216534421651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 40.

The spelling of 216534421651 in words is "two hundred sixteen billion, five hundred thirty-four million, four hundred twenty-one thousand, six hundred fifty-one".