816564692499270 has 128 divisors (see below), whose sum is σ = 2381761881354240. Its totient is φ = 176426805972480.

The previous prime is 816564692499217. The next prime is 816564692499277. The reversal of 816564692499270 is 72994296465618.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816564692499277) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3281624214 + ... + 3281873033.

It is an arithmetic number, because the mean of its divisors is an integer number (18607514698080).

Almost surely, 2^{816564692499270} is an apocalyptic number.

816564692499270 is an abundant number, since it is smaller than the sum of its proper divisors (1565197188854970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816564692499270 is a wasteful number, since it uses less digits than its factorization.

816564692499270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6563497310.

The product of its (nonzero) digits is 2821754880, while the sum is 78.

The spelling of 816564692499270 in words is "eight hundred sixteen trillion, five hundred sixty-four billion, six hundred ninety-two million, four hundred ninety-nine thousand, two hundred seventy".