216535233516425 has 6 divisors (see below), whose sum is σ = 268503689560398. Its totient is φ = 173228186813120.

The previous prime is 216535233516401. The next prime is 216535233516449. The reversal of 216535233516425 is 524615332535612.

It is an interprime number because it is at equal distance from previous prime (216535233516401) and next prime (216535233516449).

It can be written as a sum of positive squares in 3 ways, for example, as 2618399713609 + 213916833802816 = 1618147^2 + 14625896^2 .

It is not a de Polignac number, because 216535233516425 - 2⁸ = 216535233516169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4330704670304 + ... + 4330704670353.

It is an arithmetic number, because the mean of its divisors is an integer number (44750614926733).

Almost surely, 2^{216535233516425} is an apocalyptic number.

216535233516425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216535233516425 is a deficient number, since it is larger than the sum of its proper divisors (51968456043973).

216535233516425 is an equidigital number, since it uses as much as digits as its factorization.

216535233516425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8661409340667 (or 8661409340662 counting only the distinct ones).

The product of its digits is 19440000, while the sum is 53.

The spelling of 216535233516425 in words is "two hundred sixteen trillion, five hundred thirty-five billion, two hundred thirty-three million, five hundred sixteen thousand, four hundred twenty-five".