120644425665 has 24 divisors (see below), whose sum is σ = 209166782760. Its totient is φ = 64328377344.

The previous prime is 120644425663. The next prime is 120644425709. The reversal of 120644425665 is 566524446021.

120644425665 is a `hidden beast` number, since 1 + 2 + 0 + 6 + 44 + 42 + 566 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 24263981361 + 96380444304 = 155769^2 + 310452^2 .

It is not a de Polignac number, because 120644425665 - 2¹ = 120644425663 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 120644425665.

It is not an unprimeable number, because it can be changed into a prime (120644425663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126672 + ... + 507281.

It is an arithmetic number, because the mean of its divisors is an integer number (8715282615).

Almost surely, 2^120644425665 is an apocalyptic number.

120644425665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120644425665 is a deficient number, since it is larger than the sum of its proper divisors (88522357095).

120644425665 is a wasteful number, since it uses less digits than its factorization.

120644425665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638193 (or 638190 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 120644425665 in words is "one hundred twenty billion, six hundred forty-four million, four hundred twenty-five thousand, six hundred sixty-five".