645560444534 has 8 divisors (see below), whose sum is σ = 994512036288. Its totient is φ = 314056432440.

The previous prime is 645560444533. The next prime is 645560444569. The reversal of 645560444534 is 435444065546.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645560444533) 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, 4361894822 + ... + 4361894969.

It is an arithmetic number, because the mean of its divisors is an integer number (124314004536).

Almost surely, 2^645560444534 is an apocalyptic number.

645560444534 is a deficient number, since it is larger than the sum of its proper divisors (348951591754).

645560444534 is a wasteful number, since it uses less digits than its factorization.

645560444534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8723789830.

The product of its (nonzero) digits is 13824000, while the sum is 50.

The spelling of 645560444534 in words is "six hundred forty-five billion, five hundred sixty million, four hundred forty-four thousand, five hundred thirty-four".