645633045047 has 4 divisors (see below), whose sum is σ = 645660864936. Its totient is φ = 645605225160.

The previous prime is 645633045017. The next prime is 645633045143. The reversal of 645633045047 is 740540336546.

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 645633045047 - 2¹² = 645633040951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645633044992 and 645633045010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645633045007) 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, 13875104 + ... + 13921557.

It is an arithmetic number, because the mean of its divisors is an integer number (161415216234).

Almost surely, 2^645633045047 is an apocalyptic number.

645633045047 is a deficient number, since it is larger than the sum of its proper divisors (27819889).

645633045047 is a wasteful number, since it uses less digits than its factorization.

645633045047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27819888.

The product of its (nonzero) digits is 3628800, while the sum is 47.

The spelling of 645633045047 in words is "six hundred forty-five billion, six hundred thirty-three million, forty-five thousand, forty-seven".