816522203553 has 16 divisors (see below), whose sum is σ = 1256543366016. Its totient is φ = 461964470400.

The previous prime is 816522203543. The next prime is 816522203641. The reversal of 816522203553 is 355302225618.

It is not a de Polignac number, because 816522203553 - 2¹⁷ = 816522072481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816522203513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192483076 + ... + 192487317.

It is an arithmetic number, because the mean of its divisors is an integer number (78533960376).

Almost surely, 2^816522203553 is an apocalyptic number.

It is an amenable number.

816522203553 is a deficient number, since it is larger than the sum of its proper divisors (440021162463).

816522203553 is a wasteful number, since it uses less digits than its factorization.

816522203553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384970504.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 816522203553 in words is "eight hundred sixteen billion, five hundred twenty-two million, two hundred three thousand, five hundred fifty-three".