816651045 has 64 divisors (see below), whose sum is σ = 1680384000. Its totient is φ = 368566848.

The previous prime is 816651029. The next prime is 816651047. The reversal of 816651045 is 540156618.

816651045 is a `hidden beast` number, since 81 + 66 + 510 + 4 + 5 = 666.

It is not a de Polignac number, because 816651045 - 2⁴ = 816651029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816651047) 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, 69186 + ... + 80124.

It is an arithmetic number, because the mean of its divisors is an integer number (26256000).

Almost surely, 2^816651045 is an apocalyptic number.

It is an amenable number.

816651045 is an abundant number, since it is smaller than the sum of its proper divisors (863732955).

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

816651045 is a wasteful number, since it uses less digits than its factorization.

816651045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11039 (or 11033 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 816651045 is about 28577.1070089329. The cubic root of 816651045 is about 934.7142005423.

The spelling of 816651045 in words is "eight hundred sixteen million, six hundred fifty-one thousand, forty-five".