65645453551 has 4 divisors (see below), whose sum is σ = 65656990152. Its totient is φ = 65633916952.

The previous prime is 65645453537. The next prime is 65645453579. The reversal of 65645453551 is 15535454656.

It is a happy number.

65645453551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 65645453551 - 2²⁹ = 65108582639 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65645453495 and 65645453504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65645453581) 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, 5759761 + ... + 5771146.

It is an arithmetic number, because the mean of its divisors is an integer number (16414247538).

Almost surely, 2^65645453551 is an apocalyptic number.

65645453551 is a deficient number, since it is larger than the sum of its proper divisors (11536601).

65645453551 is a wasteful number, since it uses less digits than its factorization.

65645453551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11536600.

The product of its digits is 5400000, while the sum is 49.

The spelling of 65645453551 in words is "sixty-five billion, six hundred forty-five million, four hundred fifty-three thousand, five hundred fifty-one".