861654645 has 32 divisors (see below), whose sum is σ = 1535587200. Its totient is φ = 458422272.

The previous prime is 861654643. The next prime is 861654649. The reversal of 861654645 is 546456168.

861654645 is a `hidden beast` number, since 8 + 61 + 6 + 546 + 45 = 666.

It is not a de Polignac number, because 861654645 - 2¹ = 861654643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 861654645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861654643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48949 + ... + 64181.

It is an arithmetic number, because the mean of its divisors is an integer number (47987100).

Almost surely, 2^861654645 is an apocalyptic number.

It is an amenable number.

861654645 is a deficient number, since it is larger than the sum of its proper divisors (673932555).

861654645 is a wasteful number, since it uses less digits than its factorization.

861654645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15666 (or 15660 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 861654645 is about 29353.9545036099. The cubic root of 861654645 is about 951.5780402471.

The spelling of 861654645 in words is "eight hundred sixty-one million, six hundred fifty-four thousand, six hundred forty-five".