645565266453 has 16 divisors (see below), whose sum is σ = 937299844800. Its totient is φ = 393665932800.

The previous prime is 645565266439. The next prime is 645565266457. The reversal of 645565266453 is 354662565546.

It is not a de Polignac number, because 645565266453 - 2¹² = 645565262357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645565266393 and 645565266402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645565266457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195269148 + ... + 195272453.

It is an arithmetic number, because the mean of its divisors is an integer number (58581240300).

Almost surely, 2^645565266453 is an apocalyptic number.

It is an amenable number.

645565266453 is a deficient number, since it is larger than the sum of its proper divisors (291734578347).

645565266453 is a wasteful number, since it uses less digits than its factorization.

645565266453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390541652.

The product of its digits is 77760000, while the sum is 57.

The spelling of 645565266453 in words is "six hundred forty-five billion, five hundred sixty-five million, two hundred sixty-six thousand, four hundred fifty-three".