25621765073 has 4 divisors (see below), whose sum is σ = 25733650740. Its totient is φ = 25509879408.

The previous prime is 25621765063. The next prime is 25621765079. The reversal of 25621765073 is 37056712652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20604592849 + 5017172224 = 143543^2 + 70832^2 .

It is a cyclic number.

It is not a de Polignac number, because 25621765073 - 2¹² = 25621760977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25621765079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55942490 + ... + 55942947.

It is an arithmetic number, because the mean of its divisors is an integer number (6433412685).

Almost surely, 2^25621765073 is an apocalyptic number.

It is an amenable number.

25621765073 is a deficient number, since it is larger than the sum of its proper divisors (111885667).

25621765073 is a wasteful number, since it uses less digits than its factorization.

25621765073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111885666.

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 25621765073 in words is "twenty-five billion, six hundred twenty-one million, seven hundred sixty-five thousand, seventy-three".