645415045553 has 8 divisors (see below), whose sum is σ = 649166918400. Its totient is φ = 641673192208.

The previous prime is 645415045529. The next prime is 645415045559. The reversal of 645415045553 is 355540514546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645415045553 - 2³⁴ = 628235176369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645415045498 and 645415045507.

It is not an unprimeable number, because it can be changed into a prime (645415045559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2375651 + ... + 2633352.

It is an arithmetic number, because the mean of its divisors is an integer number (81145864800).

Almost surely, 2^645415045553 is an apocalyptic number.

It is an amenable number.

645415045553 is a deficient number, since it is larger than the sum of its proper divisors (3751872847).

645415045553 is a wasteful number, since it uses less digits than its factorization.

645415045553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009751.

The product of its (nonzero) digits is 3600000, while the sum is 47.

The spelling of 645415045553 in words is "six hundred forty-five billion, four hundred fifteen million, forty-five thousand, five hundred fifty-three".