645238832546 has 32 divisors (see below), whose sum is σ = 1208146848768. Its totient is φ = 251086245840.

The previous prime is 645238832533. The next prime is 645238832549.

645238832546 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×645238832546³ (a number of 36 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 645238832491 and 645238832500.

It is not an unprimeable number, because it can be changed into a prime (645238832549) 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, 2418740 + ... + 2672223.

It is an arithmetic number, because the mean of its divisors is an integer number (37754589024).

Almost surely, 2^645238832546 is an apocalyptic number.

645238832546 is a deficient number, since it is larger than the sum of its proper divisors (562908016222).

645238832546 is a wasteful number, since it uses less digits than its factorization.

645238832546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5091806.

The product of its digits is 33177600, while the sum is 56.

The spelling of 645238832546 in words is "six hundred forty-five billion, two hundred thirty-eight million, eight hundred thirty-two thousand, five hundred forty-six".