1645343312555 has 32 divisors (see below), whose sum is σ = 2063705212800. Its totient is φ = 1257755046912.

The previous prime is 1645343312521. The next prime is 1645343312573. The reversal of 1645343312555 is 5552133435461.

It is a cyclic number.

It is not a de Polignac number, because 1645343312555 - 2¹² = 1645343308459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5396879 + ... + 5693591.

It is an arithmetic number, because the mean of its divisors is an integer number (64490787900).

Almost surely, 2^{1645343312555} is an apocalyptic number.

1645343312555 is a deficient number, since it is larger than the sum of its proper divisors (418361900245).

1645343312555 is a wasteful number, since it uses less digits than its factorization.

1645343312555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297143.

The product of its digits is 3240000, while the sum is 47.

The spelling of 1645343312555 in words is "one trillion, six hundred forty-five billion, three hundred forty-three million, three hundred twelve thousand, five hundred fifty-five".