865442672649 has 48 divisors (see below), whose sum is σ = 1303145363520. Its totient is φ = 552794336640.

The previous prime is 865442672599. The next prime is 865442672657. The reversal of 865442672649 is 946276244568.

It is a happy number.

865442672649 is a `hidden beast` number, since 8 + 6 + 544 + 2 + 67 + 26 + 4 + 9 = 666.

It is not a de Polignac number, because 865442672649 - 2³⁹ = 315686858761 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (865442672849) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18165039 + ... + 18212619.

It is an arithmetic number, because the mean of its divisors is an integer number (27148861740).

Almost surely, 2^865442672649 is an apocalyptic number.

It is an amenable number.

865442672649 is a deficient number, since it is larger than the sum of its proper divisors (437702690871).

865442672649 is a wasteful number, since it uses less digits than its factorization.

865442672649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48150 (or 48147 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 63.

The spelling of 865442672649 in words is "eight hundred sixty-five billion, four hundred forty-two million, six hundred seventy-two thousand, six hundred forty-nine".